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: Skin
[{'content': 'A young boy presented with miultiple flaccid bulla and oral mucosal lesion: The most likely finding would be: \nSelect and explain. \nA. Granular lgA in reticular dermis, B. IgG in epidermis, C. Linear IgM inderoepidermal junction, D. Linear IgA in dermal papillae', 'role': 'user'}, {'content': 'Answer: B \nExplanation: IgG in epidermis', 'role': 'assistant'}]