Fact 1: Antigens are molecules that the immune system recognizes as foreign to the body. Fact 2: Antigens are expressed by cancer cells. Given the two facts above, what can recognize cancer cells as foreign to the body?
Options are: A. electromagnetic energy B. viruses C. the immune system D. bacteria E. Allergies F. Microscope G. the colon H. turn to a doctor
Answer:
C.