Tylenol Is Ordered for a Child Weighing 42 Pounds at a Dosage

Tylenol is ordered for a child weighing 42 pounds at a dosage of 15 mg per kilogram of body weight. You need to determine how many mg of Tylenol should be administered to this child in a single dose. In order to answer this question, a conversion is used that is actually written within the body of the question. Which factor is this?

A) 42 pounds = 15 mg of Tylenol
B) 42 pounds = 1 kilogram of body weight
C) 15 mg of Tylenol = 1 kilogram of body weight
D) 15 mg of Tylenol = 1 pound of body weight
E) 1 pound = 1 kilogram of body weight