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: Some pelycosaurs gave rise to a group of animals called therapsids., Fact2: Pelycosaurs are an important lineage preserved in the fossil record., Question: How do we know the lineage of therapsids? (A) Laboratory (B) dinosaurs (C) prokaryotic cells (D) some anthozoans (E) fossil record (F) oral tradition (G) polygenic (H) calibrated
Example Output: E

Example Input: Fact1: high pressure systems cause clear weather, Fact2: Weather Clear weather usually means good visibility., Question: what does a high pressure system cause? (A) hyperthyroidism (B) lowered energy cost (C) harmful substances (D) Heart rate (E) good visibility (F) It gets heated up (G) Pollution (H) rainfall
Example Output: E

Example Input: Fact1: planting trees has a positive impact on an ecosystem, Fact2: Destruction of Trees is taking place, pollution of air is the Result of cutting trees with pace., Question: What has a positive effect on an ecosystem? (A) maintaining air pollution (B) removing habitats (C) stopping air pollution (D) to stay warm (E) in the frog family (F) Electric generators (G) increasing air pollution (H) genetic diversity
Example Output:
C