Detailed Instructions: 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").
Q: Fact1: burning wood is used to produce heat, Fact2: Interior woods are birch, spruce and pine., Question: What is burned to produce heat? (A) Oak (B) Gold (C) Spruce (D) cellulose (E) Conifers (F) bamboo (G) Plastic (H) Aluminum
A:
C