Pick your answer from:
[A]. Pollution.
[B]. smoking salmon.
[C]. burning.
[D]. cigarettes.
[E]. gasoline.
[F]. lung tissue.
[G]. heating liquids.
[H]. respiration.
Given those answer options, answer the question: You are presented with the quiz "what causes lung cancer?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "lung cancer is most often caused by exposure to tobacco smoke" and "tobacco is smoked in pipes or in cigarettes or bidis". So, what's the best answer to the question?
A:
[D].