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: Echinoderms lack a centralized nervous system., Fact2: Sand dollars and sea biscuits are also echinoderms., Question: What lacks a centralized nervous system? (A) Damaged hearing (B) Humans (C) Horses (D) Sand dollars (E) insects (F) Chickens (G) Pesticides (H) barnacles
Example Output: D

Example Input: Fact1: Viruses contain DNA but not much else., Fact2: All viruses consist of RNA or DNA and a protein coat., Question: what do viruses contain? (A) Mass (B) DNA (C) SNPs (D) RNA (E) acid (F) gene (G) ovum (H) host
Example Output: D

Example Input: Fact1: carbon dioxide concentrations in the air have increased over the last decade dramatically, Fact2: Increases in carbon dioxide make the greenhouse effect worse., Question: How has the greenhouse effect changed in the last decade? (A) moved to South America (B) improved (C) Temperature (D) fossil fuels (E) has become cooler (F) worsened (G) climate (H) growth
Example Output:
F