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").
Input: Fact1: Passive immunity lasts only as long as the antibodies survive in body fluids., Fact2: Breast Milk contains antibodies., Question: What can make passive immunity last? (A) resistance (B) sweating (C) Leptospirosis (D) breast milk (E) smoking tobacco (F) the environment (G) competition (H) fur seals
Output:
D