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': 'A patient presented with oral mucosal lesions and flaccid blisters Over skin. It detects what and which pattern under microscopic examination? \nSelect and explain. \nA. Fishnet pattern IgG in epidermis, B. IgG at Dermo-epiderrnal juction, C. IgA at Dermo-epidermal junction, D. IgG in dermis', 'role': 'user'}, {'content': "Answer: A \nExplanation: In pemphigus vulgaris skin involvement stas in the form of flaccid blisters. Cutaneous lesions are usually preceded by blisters and erosions of oral mucosa In Direct immunofluorescence intercellular IgG -fishnet pattern throughout the epidermis is seen in pemphigus vulgaris. page no.280,287 Reference IADVL's concise textbook of dermatology", 'role': 'assistant'}]