Final answer:
Using Clark's Rule, the calculated dose for a 56 lb child when the adult dose is 25 mg is approximately 9 mg after rounding, which doesn't match any of the provided options.
Step-by-step explanation:
The pediatric dose of medication for a child based on Clark's Rule is calculated by multiplying the adult dose by the ratio of the child's weight in pounds to 150 (the standard adult weight in pounds). To find the appropriate dose for a 56 lb child when the adult dose is 25 mg, you use the following formula:
Pediatric dose = (Child's weight in lbs / 150 lbs) × Adult dose
So,
Pediatric dose = (56 lbs / 150 lbs) × 25 mg = (0.3733) × 25 mg ≈ 9.33 mg
When rounded to the ones place, the pediatric dose would be 9 mg. However, this is not an option provided in the question, suggesting there might be an error in the question or the available answer choices. Given the calculation method using Clark's Rule, none of the options A) 14 mg, B) 16 mg, C) 18 mg, D) 20 mg are correct for a 56 lb child when the adult dose is 25 mg based on the details provided.