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: Viruses cause many human diseases., Fact2: Some smallpox viruses are maintained in laboratories., Question: What can smallpox cause? (A) contamination (B) harmful substances (C) vaccines (D) photosynthesis (E) extinction (F) cellular respiration (G) Destroy crops (H) human disease
H

Fact1: a scale is used for measuring weight, Fact2: All weight is in pounds., Question: what is a scale used for measuring? (A) waves (B) hardness (C) SI units (D) measures (E) intensity (F) fat (G) strength (H) pounds
H

Fact1: a greenhouse is used to protect plants from the cold, Fact2: Inside a greenhouse, it is the glass roof that creates the warmth., Question: What can protect plants from cold? (A) keratin (B) habitat (C) trees (D) heat (E) glass (F) Light (G) fibers (H) peat
E