Detailed 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").
Q: Fact1: Blood pressure is highest in arteries and lowest in veins., Fact2: Apocymarin raises blood pressure., Question: what affects veins and arteries? (A) Damages them (B) Sulfur dioxide (C) Smoking (D) rays or beams (E) smoking tobacco (F) apocymarin (G) it needs them (H) heat energy
A:
F