In an early AIDS study by Dr. William Darrow of the Centers for Disease Control, an airline steward named ___ ___ was referred to as "Patient Zero" because at least 40 of the 248 people known to be infected by HIV in 1983 had had sexual intercourse with him, or with someone who had sexual intercourse with him!

a) Robert Smith
b) David Johnson
c) Gaëtan Dugas
d) Michael White