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
Which one of the following is not a lichenoid reaction? 
Select and explain. 
A. Lichenoid contact reaction, B. Pemphigus, C. Lichenoid drug eruption, D. Lichenoid reaction of graft versus host disease
B: Pemphigus
Answer: B: Pemphigus 
Explanation: Lichenoid reactions represent a family of lesions with diﬀerent etiologies with a common clinical & histological appearance. They include LIchenoid contact reactions, Lichenoid drug eruptions, Lichenoid reaction of graft versus host disease.