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: cell division often causes growth, Fact2: Mitosis is cell division., Question: What often causes growth? (A) exercise (B) hormones (C) Atrophy (D) collagen (E) Earthworms (F) Apoptosis (G) Necrosis (H) Mitosis
H

Fact1: when a metal rusts , that metal becomes orange on the surface, Fact2: Iron rusts in the presence of oxygen and water., Question: Exposure to oxygen and water can cause iron to (A) decrease strength (B) melt (C) uncontrollable burning (D) thermal expansion (E) turn orange on the surface (F) vibrate (G) Extremes of temperature (H) levitate
E

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
B