Abbah, a placebo arm is when some folks in a medical trial get a dummy treatment instead of the real medicine. It's wrong to use one when people are truly ill and waiting for help feels like a betrayal. My brother-in-law suffered in a cancer trial on placebo, so I withdrew from my own trial, khuda hafiz, no matter what the doctors say about science. Sometimes, what looks right on paper breaks your heart in life.
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