You are given a sentence, a question and two answer options ('A' and 'B'). Your task is to find the correct option for the given question. Write down the answer index: 'A' or 'B'.

Example Input: Sentence: Sam is skating outside. He glides across the dirt with no problem, but falls when he skates on gravel. Question: Which ground has less friction? (A) dirt (B) gravel
Example Output: A

Example Input: Sentence: Mike can roll his battery around quicker on a study desk then on a classroom desk. Question: Which desk is providing less resistance to the battery? (A) study desk (B) classroom desk
Example Output: A

Example Input: Sentence: A bathroom counter isn't as rough as a kitchen counter. Question: Which surface will cause a tape ball to get hotter when rolled across it? (A) bathroom counter (B) kitchen counter
Example Output:
B