Which American physician and microbiologist, working at the Rockefeller Institute, proved that a virus could cause cancer in 1911?

• A Peyton Rous ✓
• B Jonas Salk
• C Francis Peyton Rous
• D Albert Sabin

Rous discovered that a virus (Rous sarcoma virus) could cause tumours in chickens, a finding initially ridiculed but later validated, earning him the 1966 Nobel Prize.