A patient has discussed her concern over the large quantity of amalgam fillings in her mouth; she fears that the mercury may be affecting her health. She has scheduled an appointment to discuss this with the dentist. How would you expect the dentist to respond to this patient?

Which of the following statements concerning cancer and mutations is correct? a: cancer can only occur with a mutation in a somatic cell. b: usually, multiple mutations are required in different genes to cause cancer. c: none of the other answer options is correct. d: cancer can only occur with a mutation in a germ cell. e: usually, a single mutation is all that is required to cause cancer.