Q: 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: Lung cancer is most often caused by exposure to tobacco smoke., Fact2: Tobacco is smoked in pipes or in cigarettes or bidis., Question: What is lung cancer most often caused by? (A) the Moon (B) Pollution (C) sunlight (D) Chemical energy (E) fossil fuels (F) cigarettes (G) burning (H) marijuana smoke
A:
F