Fact 1: Some viruses can cause cancer. Fact 2: Some cancers are fatal. Given the two facts above, what can be fatal?

Pick from:
[A]. Electric devices;
[B]. smoking cigarettes;
[C]. smoking;
[D]. magic;
[E]. Good will;
[F]. laughter;
[G]. Some viruses;
[H]. Pesticides;
Answer:
[G].