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: Chordates have a complete digestive system and a closed circulatory system., Fact2: All of the chordates have elongated bilaterally symmetrical bodies., Question: humans have complete digestive systems and what bodies. (A) non symmetrical (B) allow growth (C) aerobic capacity (D) bilateraly symmetrical (E) steal (F) sensory neurons (G) biological diversity (H) rubber
Output:
D