A researcher conducts a study where the outcome assessment is blinded but treatment allocation is not blinded. This study design is best described as:

• A Open-label trial
• B Single-blind trial ✓
• C Double-blind trial
• D Triple-blind trial

Explanation

In a single-blind trial, one party (typically the assessor/outcome evaluator) is blinded to treatment allocation while the participant and investigator know. When the participant is blinded but investigators know, that is also single-blind. Double-blind means both participant and assessor are blinded; triple-blind adds blinding of the data analyst. Open-label means no blinding at all. Blinding the outcome assessor protects against observer bias.

Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

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