A passage describes a 'double-blind, placebo-controlled trial.' What is the primary reason for blinding both participants and researchers?
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A
To eliminate expectation bias that could influence reported outcomes and researcher assessments
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B
To ensure the placebo is indistinguishable from the active drug in chemical composition
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C
To prevent participants from withdrawing from the study prematurely
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D
To reduce the cost of administering treatments across large populations