All of the following are potential benefits of a randomized clinical trial, except:
a. The likelihood that the study groups will be comparable is increased
b. Self-selection for a particular treatment is eliminated
c. The external validity of the study is increased
d. Assignment of the next subject cannot be predicted
e. The therapy that a subject receives is not influenced by either conscious or subconscious bias of the investigator
Answer: c. The external validity of the study is increased