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").

Fact1: knowledge of the stars can be used to navigate, Fact2: Of course, astronomers also study stars., Question: What can be used to navigate? (A) music (B) backbones (C) astrology (D) cilia (E) magic (F) sponges (G) astronomy (H) lamphreys
G

Fact1: a fire requires oxygen to burn, Fact2: In the vacuum of space, there's no oxygen to burn., Question: Where is fire impossible? (A) evaporation (B) In space (C) A computer (D) uncontrolled (E) Inside a car (F) On television (G) summer end (H) On a mountain
B

Fact1: Most salamanders use their sense of smell to find a mate., Fact2: Salamanders, frogs and toads are amphibians., Question: What uses its sense of smell to find a mate? (A) passenger pigeons (B) animals (C) A whale (D) A human (E) An amoeba (F) fur seals (G) rabbit (H) An amphibian
H