This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Acne and chemical peeling, Subject name: Dental
Maximum cumulative dose of isotretinoin should not exceed 
Select and explain. 
A. 60 mg/kg, B. 90 mg/kg, C. 90-120 mg/kg, D. 120-150 mg/kg
D: 120-150 mg/kg
Answer: D: 120-150 mg/kg 
Explanation: Isotretinoin - Isomer of 13 cis retinoic acid Dose: 0.5-1 mg/kg/bwt Maximum cumulative dose: Should not exceed the maximum cumulative dose.