Teacher: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").
Teacher: Now, understand the problem? Solve this instance: Fact1: Most invertebrates have a nervous system., Fact2: Jellyfish and insects are invertebrates., Question: What has a nervous system? (A) Nerve tonic (B) Jellyfish (C) Air (D) fur seals (E) Cardiovascular system (F) animals (G) chickens (H) elephants
Student:
B