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:

Customer Transaction

An operation between a business and its customer involving the sale or purchase of goods or services.

Invoices

Documents issued by a seller to a buyer that outline the products or services provided, quantities, prices, and terms of payment.

Credit Memos

Documents issued to a customer, indicating a reduction in the amount that the customer owes to the company.

Refund Receipts

Documents that confirm the return of funds to a customer for returned goods or overpayment.