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: melting means changing from a solid into a liquid by adding heat energy, Fact2: Ice is the solid form of water., Question: What changes ice to water by adding heat energy? (A) mussels (B) melting (C) freezing (D) fertilization (E) storms (F) boiling (G) engines (H) condensation

Ex Output:
B


Ex Input:
Fact1: hydropower requires damming a river, Fact2: Another source of energy is hydropower., Question: What is a source of energy? (A) fossil fuels (B) cooking (C) damming a river (D) sleeping (E) napping (F) Electrical energy (G) our nearest star (H) sunlight

Ex Output:
C


Ex Input:
Fact1: a prism is used for refracting light, Fact2: Prism A prism is a solid geometric shape., Question: What can refract light? (A) focusing a lens (B) Electrical energy (C) solid geometric shapes (D) an electron lens (E) Something formed from skeleton (F) single-celled organisms (G) living things (H) an electron microscope

Ex Output:

C