Which of the following best defines a 'serious adverse event' (SAE) under ICH E2A guidelines?
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A
Any adverse event that causes patient discomfort lasting more than 24 hours
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B
An event resulting in death, life-threatening situation, hospitalization, disability, or congenital anomaly
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C
An adverse event that requires a dose reduction of the investigational product
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D
Any unexpected adverse event not listed in the investigator's brochure