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: Plasma cells are activated B cells that secrete antibodies., Fact2: Antibodies are manufactured by the immune system., Question: The molecules secreted by activated B cells are part of the: (A) immune system (B) Organic compounds (C) Energy. (D) an organism's body (E) acetic acid (F) harmful substances (G) Chemical energy (H) Veins and arteries.
Solution:
A