Instructions: 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: a stem is used to store water by some plants, Fact2: Some plants also store water in their trunks and stems., Question: Where do plants store water? (A) watershed (B) Collagen (C) excretory (D) trunks (E) fibrils (F) soil (G) Winter (H) cellulose
Output:
D