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: Some viruses have an envelope of phospholipids and proteins., Fact2: Phospholipids are body fats, too., Question: Some viruses have an envelope of (A) fats and proteins (B) allow growth (C) aerobic capacity (D) keeps the organism warm (E) wavelengths and photons (F) Chemical energy (G) looseness (H) To keep their body heat.
Output:
A