Explanation:

When a snake bites someone, the venom injected into the body can have various effects on the person's body. In this case, the correct answer is option 'B' - काला (Black).

Effects of Snakebite:

1. Swelling: Snake venom can cause severe swelling at the site of the bite. The affected area may become red, inflamed, and painful.

2. Necrosis: Some snake venoms can cause tissue death, leading to the formation of blackened or necrotic areas around the bite site. This is why the boy's body turned black.

3. Systemic Effects: Snake venom can also have systemic effects on the body, affecting various organs and systems. These effects may include nausea, vomiting, abdominal pain, dizziness, difficulty breathing, and changes in heart rate.

4. Hemorrhage: Certain snake venoms have anticoagulant properties, which can lead to bleeding disorders and internal bleeding. This can manifest as bleeding from the gums, nose, or other parts of the body.

5. Neurotoxicity: Some snake venoms contain neurotoxins that can affect the nervous system. This can result in symptoms such as muscle weakness, paralysis, blurred vision, difficulty speaking, and respiratory failure.

Treatment:

Snakebites are medical emergencies, and immediate medical attention is required. The treatment of snakebite may involve:

1. Immobilization: The affected limb should be immobilized to prevent the spread of venom.

2. Antivenom: Antivenom is the most effective treatment for snakebite. It is a specific antidote that neutralizes the venom. The appropriate antivenom should be administered as soon as possible.

3. Supportive Care: Supportive care may include pain management, wound care, and monitoring of vital signs. In severe cases, additional treatments such as respiratory support or blood transfusion may be required.

It is crucial to seek medical help immediately after a snakebite to ensure proper treatment and minimize complications.