Italian researchers Benedetti, Amanzio, and Maggi (1995) included an uncommon control group in their study of the analgesic effect of proglumide in post-surgical patients. What was this group?
a. Patients who received saline, but did not know it.
b. Patients who received proglumide, but did not know it.
c. Patients who were told they were receiving saline.
d. Patients who were told they were receiving proglumide.
e. None of the above groups is uncommon in analgesic drug research.
Answer: B
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