Which of the options is a wrong answer to this question: How does a double blind ensure a better trial of a new drug?
Explanation:
As per the first sentence of the paragraph, the overall effect of a drug was calculated by subtracting the placebo response to the overall response. Option 1 is a right answer since in this case, even doctors do not know if the drug they are administering is a placebo or not. So they cannot be biased about giving the drug. Negate option 1. Since neither the patient nor the doctor knows of the drug is real or not, the response will be unbiased. Negate option 2. Option 3 is incorrect as only not knowing the type of drug taken will not increase the overall response to any drug. Retain it. Option 4 is true as scientists or researchers can calculate the effect of the placebo from the actual drug. So it can also be negated. Option 5 is also true as the patient does not know the type of drug that he is taking. Hence, the correct answer is option 3.
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