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: 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: a plant requires sunlight to grow, Fact2: Sunlight is turned into energy by plants., Question: Sunlight is made of (A) Prism (B) lightning (C) colors (D) glass (E) chlorophyll (F) dirt (G) energy (H) photons
G

Fact1: pathogens can cause disease, Fact2: Mad Cow disease is a concern., Question: What can cause Mad Cow? (A) Pollution (B) bacteria (C) cows (D) horses (E) illness (F) pathogens (G) influenza (H) chickenpox
F