During the double-blind, placebo-controlled food challenge, _____
a. only the care provider knows whether a suspected offending food or a placebo is being tested
b. only the patient knows whether a suspected offending food or a placebo is being tested
c. neither the patient nor the care provider knows whether a suspected offending food or a placebo is being tested
d. both the patient and the care provider know whether a suspected offending food or a placebo is being tested
e. medical supervision is not needed
c
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Fill in the blank(s) with correct word
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