This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fungal infections, Scabies, Pediculosis, Subject name: Dental
Drug of choice for Norwegian scabies 
Select and explain. 
A. permethrin 5%, B. Lindane1%, C. Oral ivermectin, D. Sulphur6%
C: Oral ivermectin
Answer: C: Oral ivermectin 
Explanation: Drug of choice for Norwegian scabies - Oral ivermectin 200ug/kg/dose, two doses 10 days apa. topicals are not effective in the treatment as the crusted plaques will hinder the absorption of topical drugs. iadvl textbook of dermatology page 459