In Order to Compile and Accurately Measure Its Effectiveness, the Subject

Multiple Choice

In order to compile and accurately measure its effectiveness, the subject pool for a new antidepressant was about 200 subjects. The pharmaceutical company prescribes 100 subjects the new medication X and a sugar pill for the remaining 100 individuals. To ensure effectiveness, the subjects are unaware of who has taken medication X and who has taken the sugar pill. This practice is known as:

A) experimenter bias.
B) pharmaceutical design.
C) placebo.
D) subject bias.