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: Skin
Which of the following drug is used in scabies as single oral dose agent: March 2011 
Select and explain. 
A. Permethrin, B. Retinoids, C. Ivermectin, D. Co-trimoxazole
C: Ivermectin
Answer: C: Ivermectin 
Explanation: Ans. C: Ivermectin Ivermectin is used as single oral dose of 200 microgram/ kg body weight It can be repeated after 2 weeks It is indicated in epidemics of scabies in orphanages and Norwegian scabies Scabies: Incubation period: 4 weeks Pathognomic lesion: Burrow, which lies in stratum corneum MC site in infants: Scalp, face Most severe form: Norwegian scabies Drug used orally: Ivermectin