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: Pathology
Tzanck smear test is used in the diagnosis of 
Select and explain. 
A. Pemphigus, B. ANUG, C. Apthous disease, D. Lichen planus
A: Pemphigus
Answer: A: Pemphigus 
Explanation: Tzanck test is also used for diagnosis of viral diseases like Herpes Zoster.