Detailed 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").
Problem:Fact1: Lymphocytes are the key cells involved in the immune response., Fact2: B lymphocytes produce antibodies ., Question: The cells that produce antibodies are key in what system? (A) health (B) T cells (C) vision (D) humans (E) macrophages (F) B cells (G) disease (H) immune
Solution:
H