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
[{'content': 'Which one of the following is not a lichenoid reaction? \nSelect and explain. \nA. Lichenoid contact reaction, B. Pemphigus, C. Lichenoid drug eruption, D. Lichenoid reaction of graft versus host disease', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Lichenoid reactions represent a family of lesions with diﬀerent etiologies with a common clinical &\xa0histological appearance. They include LIchenoid contact reactions, Lichenoid drug eruptions, Lichenoid\xa0reaction of graft versus host disease.', 'role': 'assistant'}]