Q: 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: Constriction occurs when the muscular walls of blood vessels contract., Fact2: Arteries and veins are blood vessels., Question: What happens when muscular walls of arteries and veins contract? (A) connection (B) It expands (C) Dehydration (D) construction (E) forces (F) massive damage (G) constriction (H) contraction
A:
G