Given the task definition and input, reply with output. 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.

Sentence: Each planet has a substantial gravitational pull. Uranus bigger than earth but still much smaller than the sun. Question: Which object has a weaker gravitational pull? (A) Sun (B) Uranus
Uranus