Teacher: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.
Teacher: Now, understand the problem? Solve this instance: Sentence: Mercury is less massive than Mars. Question: Which one has the weaker gravitational force? (A) Mars (B) Mercury
Student:
Mercury