Given the task definition and input, reply with output. 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: Passive immunity lasts only as long as the antibodies survive in body fluids., Fact2: Breastfeeding provides passive and likely long-lasting active immunity., Question: What lasts only as long as the antibodies survive in body fluids? (A) recovery time from fatigue (B) Food poisoning (C) during the day (D) Leptospirosis (E) retaining heat (F) breastfeeding provides (G) an area swollen with pus (H) Something that causes allergies
F