Q: 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").
Fact1: Plasma cells are activated B cells that secrete antibodies., Fact2: All cells have a plasma membrane., Question: what are membranes made of? (A) complex (B) SO2 (C) matter (D) made (E) lmestone (F) plasma (G) Energy (H) an ion
A:
F