This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
[{'content': "For calculating drug dosage, which of the following formula is not age-dependent: \nSelect and explain. \nA. Young's formula., B. Cushing's rule., C. Cowling's formula., D. Clark's rule.", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]