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: vein deposits of gold and silver are formed by igneous intrusion, Fact2: Granite, on the other hand, is an intrusive igneous rock., Question: what are vein deposits of gold and silver formed by? (A) mines (B) tube (C) calcite (D) cracking (E) rocks (F) wind (G) granite (H) streams
A:
G