Teacher: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").
Teacher: Now, understand the problem? Solve this instance: Fact1: Carbon monoxide is a gas produced by furnaces and other devices that burn fuel., Fact2: Any fuel that is incompletely burned produces carbon monoxide, a colorless, odorless gas., Question: What happens when a fuel burns incompletely? (A) Carbon monoxide disappears (B) direct damage to the lungs (C) deadly and devastating (D) Carbon monoxide is created (E) retaining heat (F) Oxygen increases (G) permineralization (H) It's recycled
Student:
D