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: coal is used for generating heat by burning, Fact2: Coal and lignite are the lithified remains of plants., Question: What are the lithified remains of plants used for? (A) heat production (B) generating heat by burning (C) harvesting crops (D) damming rivers (E) food and shelter (F) heat is produced (G) A transportation fuel (H) planting seeds
Example Output: B

Example Input: Fact1: erosion of soil has a negative impact on the environment, Fact2: Weathering and erosion continue to shape it today., Question: What has a negative impact on the environment? (A) harmful substances (B) weathering of soil (C) saving water (D) planting trees (E) deforestation (F) massive damage (G) recycling (H) enormous damage to homes
Example Output: B

Example Input: Fact1: Most arthropods are insects., Fact2: Every insect has six legs, that's an insect., Question: How many legs do most arthropods have? (A) legs (B) Many (C) 12 (D) six (E) four (F) zero (G) eight (H) two
Example Output:
D