#20 is A.
#21 is A. or C.
#22 is C.
#23 is D.
#25 is 1st and 2nd one
#26 is D.
#27 is 3rd and 4th one
#28 is is B.
Answer:
(C) be less likely to expect symptom relief
Explanation:
This is a blind study in which the patient believes he receives a drug but takes a flour pill (placebo). Eventually, the placebo effect improves people's condition because they believe they are on medication. However, the likelihood is much lower compared to who actually receives an active substance that acts to curb the disease.