Statistic question?

Suppose a pharmaceutical company is designing a​ double-blind experiment to test their new allergy medication. They divide the 200 subjects by gender and then randomly assign the men and women to either receive the medication or a placebo. The researcher finds that even the group receiving the placebo​ (a sugar​... show more Suppose a pharmaceutical company is designing a​ double-blind experiment to test their new allergy medication. They divide the 200 subjects by gender and then randomly assign the men and women to either receive the medication or a placebo. The researcher finds that even the group receiving the placebo​ (a sugar​ pill) showed a decrease in allergy symptoms. Which of the following accounts for this​ result?
Choose the correct answer below.
Blocking
Confounding
Response bias
Placebo effect
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