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").

Example Input: Fact1: mechanical weathering is when rocks are broken down by mechanical means, Fact2: Water is a mechanical weathering force., Question: What  weathers rocks? (A) soil (B) streams (C) a delta (D) calcite (E) erosion (F) water (G) grass (H) the sun
Example Output: F

Example Input: Fact1: Most salamanders use their sense of smell to find a mate., Fact2: Like frogs, salamanders are amphibians., Question: What uses its sense of smell to find a mate? (A) the Sun (B) peachleaf willow (C) rocks (D) fur seals (E) warm-blooded (F) trees (G) passenger pigeons (H) some amphibians
Example Output: H

Example Input: Fact1: adding salt to a liquid decreases the melting point of that liquid, Fact2: The melting point depends on the nature of the liquid., Question: Adding salt to a liquid changes what aspect of the liquid? (A) salinity (B) Dilution (C) energy (D) nature (E) Energy. (F) heat (G) ligt (H) reduce
Example Output:
D