Introduction:
Cimetidine and Ranitidine are both commonly used antacids that are used to treat conditions such as acid reflux, gastric ulcers, and heartburn. They belong to a class of medications known as H2 receptor antagonists, which work by reducing the production of stomach acid. While both medications are effective in treating acidity, Ranitidine is considered to be a better antacid than Cimetidine.

Explanation:
1. Removal of symptoms and cause of acidity:
The correct answer for this question is option B, which states that Cimetidine and Ranitidine remove both the symptoms and cause of acidity. This is because these medications work by blocking the action of histamine on the H2 receptors in the stomach, which reduces the production of stomach acid. By reducing the acid production, they provide relief from the symptoms of acidity such as heartburn, chest pain, and regurgitation. At the same time, by targeting the cause of acidity, they help to heal any underlying conditions that may be causing the excess acid production, such as gastric ulcers or gastroesophageal reflux disease (GERD).

2. pH of the stomach:
Option A states that Cimetidine and Ranitidine keep the pH of the stomach neutral. While it is true that these medications can help to reduce the acidity in the stomach, they do not necessarily keep the pH neutral. The stomach normally has an acidic pH range of approximately 1.5 to 3.5, which is important for the digestion of food and the killing of bacteria. However, excessive acidity can lead to discomfort and damage to the lining of the stomach and esophagus. Cimetidine and Ranitidine help to normalize the pH by reducing the excessive acid production, but they do not necessarily keep it neutral.

3. Synthesis:
Option C states that Cimetidine and Ranitidine are easily synthesized. While this may be true from a chemical perspective, the ease of synthesis does not necessarily make them better antacids. The effectiveness of an antacid is determined by its ability to reduce acid production and provide relief from symptoms, not by the ease of synthesis.

4. Restriction of action:
Option D states that Cimetidine and Ranitidine restrict their action only to neutralizing the excess acid. This is partially true, as these medications primarily work by reducing the production of stomach acid. However, they also have some additional effects, such as promoting the healing of gastric ulcers and reducing the frequency of acid reflux episodes. Therefore, their action is not solely limited to neutralizing excess acid.

Conclusion:
In conclusion, the correct answer to the question is option B. Cimetidine and Ranitidine are better antacids because they remove both the symptoms and cause of acidity. While they may also have some additional effects and do not necessarily keep the pH of the stomach neutral, their ability to reduce acid production and provide relief from symptoms makes them effective antacids.