Distinguish allocation concealment from blinding.

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Allocation concealment and blinding tackle bias at different points in a trial. Allocation concealment prevents selection bias by ensuring the person enrolling participants cannot predict or influence the next assignment, so who gets into which group isn’t steered. Blinding protects against performance and assessment biases by keeping participants, and sometimes those delivering the treatment or evaluating outcomes, unaware of which treatment was given. The statement that fits best is that allocation concealment hides the next assignment from investigators, and blinding hides the treatment from participants, yet both can still influence data interpretation because biases can creep in during measurement or analysis even when these safeguards are in place. The other options misstate the roles or imply they are the same concept, or limit allocation concealment to data analysis bias.