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 Input:
Fact1: a battery converts chemical energy into electrical energy, Fact2: Electricity is a form of energy and is sometimes called electrical energy., Question: How does a battery work? (A) dormant state (B) hydrogen and oxygen (C) Throwing it away (D) Charging it (E) It converts power (F) Plugging it in (G) It remains dormant (H) to move people

Ex Output:
E

Ex Input:
Fact1: a mirror is used for reflecting light, Fact2: Light seems to travel in rays or beams., Question: what can a mirror be used to reflect? (A) noble gases (B) air particles (C) glass (D) focusing a lens (E) rays or beams (F) photons (G) sun's heat (H) an electron lens

Ex Output:
E

Ex Input:
Fact1: All cnidarians are aquatic., Fact2: Cnidarians include jellyfish and anemones., Question: what are jellyfish? (A) aquatic (B) protozoa (C) land (D) air (E) underground (F) Porifera (G) vorticella (H) backbones

Ex Output:
A