To answer this question, we need to determine the relationship between Anil and the person described.

The sentence states that the person is Anil's sibling's paternal grandfather's only daughter's only child.

Let's break it down step by step:

1. Anil's sibling - This refers to Anil's brother or sister.
2. Paternal grandfather - This refers to the father's father.
3. Only daughter - This refers to the paternal grandfather's only daughter.
4. Only child - This refers to the only child of the paternal grandfather's only daughter.

Based on the given information, we can conclude that Anil's sibling's paternal grandfather's only daughter's only child is Anil's cousin.

Therefore, the correct answer is B) Cousin.

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