At an annual physical a patient weighs 198 lbs, which is the equivalent of kilograms. (Round answer to nearest whole number, enter numeric value only.)

To convert pounds to kilograms, we use the conversion factor 1 lb = 0.453592 kg. Therefore, to find the equivalent weight in kilograms, we multiply 198 lbs by 0.453592 kg/lb. This gives us approximately 89.811 kg, which rounds to 90 when rounded to the nearest whole number. The correct answer is 90 because it represents the weight of the patient in kilograms. The other choices are incorrect as they do not accurately convert the weight from pounds to kilograms.