The most conclusive evidence that viruses cause cancers is provided by:
A)the presence of oncogenes in humans
B)the presence of antibodies against viruses in cancer patients
C)treating cancer patients with antibiotics
D)development of a cancer following an injection of viruses

Question

Quizplus · Accepted Answer

The development of cancer following an injection of viruses provides the most conclusive evidence that viruses cause cancers. This is known as the "viral oncogenesis" theory, which suggests that viruses cause cancer by inserting their genetic material into host cells and disrupting the normal regulation of cell growth and division. Antibodies against viruses in cancer patients and the presence of oncogenes in humans suggest a correlation between viruses and cancer, but do not provide definitive proof of causation. Treating cancer patients with antibiotics is not effective against viruses, which are not sensitive to antibiotic treatment.

The Most Conclusive Evidence That Viruses Cause Cancers Is Provided