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: Invertebrates are animals that lack a vertebral column, or backbone., Fact2: Insects are the most common invertebrates., Question: What don't insects have? (A) Sensory organs (B) Chlorophyll (C) exoskeleton (D) Energy. (E) Energy (F) nerves (G) backbones (H) antennae
Output:
G