In the Mid-1990s, a Study Was Conducted to Determine If

Multiple Choice

In the mid-1990s, a study was conducted to determine if arthroscopic surgery was an effective treatment for arthritis of the knee.Ten men were scheduled for surgery and each patient was anesthetized.But, after each patient was unconscious, the surgeon consulted a randomly generated code to determine whether to do the actual surgery, or to perform a "sham" surgery (make three small incisions in the knee, stitch the patient up, and leave a small scar) .This is best described as a(n) _________________ study.

A) voluntary
B) observational
C) medical
D) experimental