A total of 6972 homosexual and bisexual men have been enrolled since April 1984 in an ongoing study of HIV/AIDS. Participants are contacted twice a year to answer detailed lifestyle and medical questionnaires and provide a blood sample.
Which type of study design is being used?
A) Retrospective, case-control observational study
B) Prospective, cohort observational study
C) Completely randomized experiment
D) Matched pairs experiment
Correct Answer:
Verified
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