Answer
Luc Montagnier was a virologist, a scientist who studies viruses. He is best known for his work on HIV, the virus that causes AIDS. In 1983, Montagnier and Françoise Barré-Sinoussi discovered the virus that causes AIDS, a discovery that led to the development of the HIV test and treatments for the disease. Montagnier was awarded the Nobel Prize in Physiology or Medicine in 2008 for his work on HIV.