Clients Enrolled in a Clinical Drug Trial Are Told That

Clients enrolled in a clinical drug trial are told that they might receive a placebo drug as part of a control group.A client asks the nurse what a placebo is.Which response by the nurse is the most appropriate?

A) A placebo is a substance that has no therapeutic effect."
B) "A placebo is a similar drug that is safe."
C) "A placebo is a drug that has been tested before."
D) "A placebo is an over-the-counter drug."