A nurse is assisting an assistive personnel to document a client's weight in the medical record. Which of the following should the nurse identify as a metric unit?

A. Ounce: An ounce is part of the household/apothecary system, not the metric system. It may be used for volume or weight but is non-metric. B. Minim: A minim is an apothecary unit of volume, not a metric measurement, and is rarely used in modern practice. C. Pound: A pound is an avoirdupois unit of weight, not a metric unit. Pounds are often converted to kilograms in healthcare for accuracy. D. Kilogram: A kilogram is a standard metric unit of weight, commonly used in healthcare for recording client weights and medication calculations.