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: Pollen consists of tiny grains that are the male gametes of plants., Fact2: Flowers are the sex organs of certain plants and hold the male and female gamete producing systems., Question: pollen consists of tiny grains that are held within what (A) bees (B) fruits (C) vegetation (D) flowers (E) lmestone (F) an object (G) loose dirt (H) leaves
Output:
D