This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vestibulobullous disorders, Subject name: Dental
[{'content': 'Most common pemphigus is- \nSelect and explain. \nA. Pemphigus vulgaris, B. Pemphigus vegetans, C. Pemphigus foliaceus, D. Pemphigus erythematosus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The several variant of pemphigous are pemphigous vulgaris, P. foliaceus, P. erythematosus, P. vegetans. In this the most common is pemphigous vulgaris. From illustrated synopsis of dermatology and sexually transmitted diseases neena khanna 5th edition page no 78', 'role': 'assistant'}]