Causative agent of AIDS was discovered in -: (A) 1983, (B) 1976, (C) 1969, (D) 1992
Answer is A. Ans. is 'a' i.e., 1983 * In 1983, human immunodeficiency virus (HIV) was isolated from a patient with lymphadenopathy, and by 1984 it was demonstrated clearly to be the causative agent of AIDS.