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: Dental
[{'content': 'In pemphigus vulgaris, antibodies are present against – \nSelect and explain. \nA. Basement membrane, B. Intercellular substance, C. Cell nucleus, D. Keratin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Pemphigus is an autoimmune disease, with formation of antibodies to pemphigus antigen present in intercellular substance. Pemphigus antigens are desmoglein 3 &\xa01\xa0in P. vulgaris and desmoglein 1 in P. foliaceous.', 'role': 'assistant'}]