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: volcanic ash in the atmosphere decreases the temperature by blocking the sun, Fact2: Ash clouds are a particular problem for aircraft., Question: What are particular problems for aircraft in the atmosphere? (A) transportation (B) clog airways (C) extremely low humidity (D) volcanic clouds (E) feedback mechanisms (F) negative feedback (G) gas spreads in the air (H) very complex
Example Output: D

Example Input: Fact1: DNA contains genetic instructions for proteins, and RNA helps assemble the proteins., Fact2: DNA is the genetic material responsible for heredity., Question: The genetic material responsible for heredity contains what? (A) wavelengths and photons (B) instructions for proteins (C) characteristics (D) pre-assembled proteins (E) organelles (F) Chemical energy (G) A compound that donates proton (H) blood
Example Output: B

Example Input: Fact1: Vertebrates are all chordates that have a backbone., Fact2: Invertebrates are animals who lack a backbone or spinal column., Question: What do all vertebrates have that invertebrates don't? (A) sensory neurons (B) fur and fat (C) bones and joints (D) a jaw bone (E) kinetic energy (F) Chemical energy (G) a spinal column (H) a set of gills
Example Output:
G