In a clinical trial protocol, an 'allowed concomitant medication' list is provided. A subject requires a drug NOT on the list. The investigator should:
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A
Prescribe the medication and document it as standard of care
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B
Withhold the medication until the subject completes the trial
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C
Consult the protocol's prohibited medication section, contact the sponsor, and document the decision
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D
Automatically discontinue the subject from the trial