The Most Conclusive Evidence That Viruses Cause Cancers Is Provided

question 49

Multiple Choice

The most conclusive evidence that viruses cause cancers is provided by

• A) finding oncogenes in viruses.
• B) some liver cancer patients having had hepatitis.
• C) cancer following injection of cell-free filtrates.
• D) the presence of antibodies against viruses in cancer patients.
• E) treating cancer with antibodies.

---

Definitions:

Progesterone

A steroid hormone involved in the menstrual cycle, pregnancy, and embryogenesis of humans and other species.

Spermicidal Agents

Substances used to kill sperm, often used as a form of contraception.

Perimenopause

The transition phase before menopause, marked by irregular menstrual cycles and changes in hormone levels, leading up to the end of reproductive years.

Erectile Dysfunction

Erectile dysfunction is a condition characterized by the inability to achieve or maintain an erection sufficient for satisfactory sexual performance.