Explanation:
Osazones are crystalline compounds that are formed when certain sugars react with phenylhydrazine. They are commonly used to identify and differentiate sugars based on their unique crystal structures.

In this question, we are given four options: galactose, glucose, fructose, and arabinose. We need to determine which pairs of sugars form the same osazone.

1. Galactose:
Galactose is a monosaccharide that is commonly found in dairy products. When galactose reacts with phenylhydrazine, it forms a specific osazone with a distinct crystal structure.

2. Glucose:
Glucose is another monosaccharide that is commonly referred to as blood sugar. When glucose reacts with phenylhydrazine, it forms a different osazone with a unique crystal structure.

3. Fructose:
Fructose is a monosaccharide that is commonly found in fruits and honey. When fructose reacts with phenylhydrazine, it forms a different osazone with its own crystal structure.

4. Arabinose:
Arabinose is a monosaccharide that is commonly found in plant gum and some fruits. When arabinose reacts with phenylhydrazine, it forms a specific osazone with a distinct crystal structure.

Based on these explanations, we can conclude that glucose and fructose form the same osazone because they have the same chemical structure. Therefore, the correct answer is option B and C.

Summary:
The correct pairs of sugars that form the same osazone are glucose and fructose. The other options, galactose and arabinose, form different osazones with their own unique crystal structures.