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").

[Q]: Fact1: Cancer cells divide more often than normal cells, and grow out of control., Fact2: Cancer is an example of a mutation in cells., Question: What divide more often than normal cells, and grow out of control? (A) white blood cells (B) Most plants (C) hair cells (D) skin cells (E) Smoking (F) peachleaf willow (G) mutated cells (H) cigarettes
[A]: G


[Q]: Fact1: Feathers help birds fly and provide insulation., Fact2: Some birds are flightless birds., Question: Why do the flightless have feathers? (A) layers of fat (B) Sublimation (C) it needs them (D) warm-blooded (E) Air conditioning (F) Radiation (G) Insulation (H) protect them
[A]: G


[Q]: Fact1: hearing is used for sensing sound by animals, Fact2: If an animal is a dog then it is a mammal., Question: Dogs use hearing for  (A) food and shelter (B) population movement (C) sensing sound (D) circulatory systems (E) chemical messengers (F) courtship (G) support (H) it can be seen
[A]:
C