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").
Q: Fact1: Veins generally carry deoxygenated blood., Fact2: Blood carries blood cells., Question: What do veins carry? (A) copper (B) glucose (C) Energy (D) Length (E) oxygen (F) warmth (G) Cells (H) voltage
A:
G