The most conclusive evidence that viruses cause cancers is provided by
A) cancer following injection of cell- free filtrates.
B) finding oncogenes in viruses.
C) some liver cancer patients having had hepatitis.
D) treating cancer with antibodies.
E) the presence of antibodies against viruses in cancer patients.

Question

Quizplus · Accepted Answer

The most conclusive evidence is when cancer develops after injection of cell-free filtrates containing viruses, demonstrating a direct causal relationship.

The Most Conclusive Evidence That Viruses Cause Cancers Is Provided