Definition: 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: a glacier causes mechanical weathering, Fact2: Largest of the glacier-formed lakes is Karakul., Question: What can be formed by mechanical weathering? (A) NaCl (B) white (C) rock (D) tube (E) soils (F) Roads (G) Lakes (H) sand
Output:
G