After a Six-Week Period of Controlled Trials, Health Canada Approves

After a six-week period of controlled trials, Health Canada approves a drug that appears safe and effective in the treatment of school-age boys with ADHD. Once it is approved, doctors are permitted to prescribe it:

A) for patients that match subjects in the controlled study in regard to age, in this example, school-age boys and girls.
B) for patients that match subjects in the controlled study in regard to gender, in this example, males with a diagnosis of ADHD.
C) for other conditions, and to other populations, than those on which it was originally tested.
D) for patients that match subjects in the controlled study in regard to ethnicity/culture.