Definition: In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").
Input: Fact1: gravity causes objects that have mass to be pulled down on a planet, Fact2: Planet Mars Mars is the fourth planet from the sun and is most like Earth., Question: where does gravity cause objects that have mass to be pulled down to? (A) rocks (B) Large. (C) meters (D) matter (E) Mars (F) oceans (G) feet (H) ground
Output:
E