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").

[EX Q]: Fact1: satellites are used to take images from space, Fact2: Satellite images are digital photographs., Question: Satellites are used to take what from space? (A) rapid changes occur (B) snow, ice, and rock (C) trees and flowers (D) painters (E) occurs over a wide range (F) digital photographs (G) digital files (H) photographers
[EX A]: F

[EX Q]: Fact1: Roundworms may be free-living or parasitic., Fact2: Roundworms make up the roundworm phylum, Nematoda., Question: What can the phylum Nematoda be? (A) dangerous (B) parasitic (C) horses (D) meiosis (E) more abundant (F) graptolites (G) homogenous (H) phytoplankton
[EX A]: B

[EX Q]: Fact1: propulsion is used for flying by a spacecraft, Fact2: When Apollo 12 took off, the spacecraft was hit by lightning., Question: what used propulsion for flying? (A) dogs (B) jellyfish (C) humans (D) emu (E) Apollo 12 (F) ostrich (G) mammals (H) vertebrates
[EX A]:
E