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 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: webbed feet are used for moving faster through water by aquatic animals, Fact2: Animals move around, seeking their prey., Question: What do webbed feet help aquatic animals do? (A) rapid expansion (B) root growth (C) Catch prey (D) support (E) Regrows it (F) squeeze (G) Relieve pain (H) improve

Ex Output:
C

Ex Input:
Fact1: Many nucleotides bind together to form a chain called a polynucleotide., Fact2: Nucleotides are the building blocks of DNA ., Question: what are the building blocks of DNA? (A) Plants growth (B) Plant reproduction (C) Organic compounds (D) it needs them (E) Earth orbiting the Sun (F) major threat to health (G) Chemical energy (H) polynucleotides

Ex Output:
H