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 light bulb converts electrical energy into light energy when it is turned on, Fact2: Light bulbs are rated in Watts., Question: How is converted energy into light energy rated? (A) energy (B) unique (C) heat (D) good (E) watts (F) parsec (G) kilojoule (H) kinetic energy

Ex Output:
E

Ex Input:
Fact1: a breathing mask is used for keeping harmful particles from entering the respiratory system, Fact2: Pulmonologists treat lungs and respiratory systems., Question: what does a breathing mask keep harmful particles from entering? (A) skin (B) tissue (C) stomach (D) h2o (E) H20 (F) air (G) lungs (H) gas masks

Ex Output:
G

Ex Input:
Fact1: vein deposits of gold and silver are formed by igneous intrusion, Fact2: Intrusive igneous rocks form underground., Question: Where are gold and silver formed naturally? (A) inactive (B) Near platinum alloys (C) electrically (D) aqueous solution (E) eukyarotes (F) In a royal palace (G) Above ground (H) Underground

Ex Output:
H