You are given a sentence, a question and two answer options ('A' and 'B'). Your task is to find the correct answer (return the string of the correct option, not 'A' or 'B') for the given question.

Example Input: Sentence: A comet has been flung to the center of the solar system between the Sun and Mercury. The Sun is magnitudes larger in terms of mass than is Mercury. Question: Which body has the higher amount of gravitational pull and will pull the comet into its orbit? (A) The Sun (B) Mercury
Example Output: The Sun

Example Input: Sentence: Kerry and Felicia are rollerskating at the beach.  Kerry stops to get an ice cream cone. Question: An hour later, who has gone further? (A) Kerry (B) Felicia
Example Output: Felicia

Example Input: Sentence: A boy slid in the mud, after walking across the grass yard with no problem. Question: Which had more resistance? (A) mud (B) grass
Example Output:
grass