According to the 24-hour clock, a patient arrived in the emergency room at 16:15. At what time on the 12-hour clock did the patient arrive?

For a 24-hour time after 12:00, subtract 12 from the hour to convert to the 12-hour clock. Since 16 − 12 = 4, 16:15 is 4:15 p.m. The correct choice is 4:15 p.m.

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