The main purpose of the study was to examine the effects of a new drug on the body’s immune system. Researchers recruited volunteers for the study, who were randomly assigned to either a treatment group or a control group. The volunteers in the treatment group received the new drug, while the volunteers in the control group received a placebo. The researchers then monitored the volunteers for a period of six months, measuring various immune system parameters. At the end of the study, the researchers found that the volunteers in the treatment group had a significantly lower incidence of infection than the volunteers in the control group.

SAT · English · previous-year question