To avoid biases in the data gathering during a clinical trial involving human subjects sometimes trials are conducted single-blinded or double-blinded, which means that the parties aren’t aware of the treatment assignment. In a single-blinded trial usually, the subjects are unaware of the treatment assignment, whereas in a double-blinded usually the subjects and the investigators are unaware. Sometimes even data analysts who assess the outcomes are unaware.
The correct answer is D.
References:
EMA GCP glossary
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