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: Pharmacology
Scabies can be effectively treated systemically by : 
Select and explain. 
A. Psoralens, B. Ivermectin, C. Permethrin, D. Cotrimoxazole
B: Ivermectin
Answer: B: Ivermectin 
Explanation: None