In a double-blind randomized controlled trial, an emergency unblinding for a single subject is medically necessary. What is the correct procedure?
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A
The principal investigator unilaterally decides the treatment assignment without documentation
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B
Follow the sponsor's emergency unblinding procedure, notify the sponsor promptly, and document the reason and outcome
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C
Unblind the entire cohort to maintain consistency and fairness
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D
Delay unblinding until the next scheduled Data Safety Monitoring Board meeting