Task: Question Answering
Input (English): Question: Which of the following statements is definitely true , if A is the brother of B and C. Q is B's son and R is A's father.

 Option A: A is B's son

 Option B: A is C's son

 Option C: A is B's nephew

 Option D: A is B's niece

 Option E: A is Q's uncle
Output (English): Option E