Definition: 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'.
Input: Sentence: Tony and Alex are riding motorcycles across the country.  Tony rides until early afternoon, but Alex rides until nightfall. Question: Who rode farther? (A) Tony (B) Alex
Output:
B