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: Lisa is studying for her exam. She is working at her desk on the computer and reading. She has no issues reading the tiny print. Question: The light source in the room must be a? (A) Desk Lamp (B) Floor Lamp
Example Output: A

Example Input: Sentence: Tony is taking a trip to Florida.  He goes by plane and returns by bus. Question: What trip took less time? (A) the trip to Florida (B) the trip back
Example Output: A

Example Input: Sentence: Pluto has a smaller mass then Venus. Question: Which planet emits less gravity? (A) Venus (B) Pluto
Example Output:
B