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': 'Which of the following presents with a "string of pearl appearance"? \nSelect and explain. \nA. Pemphigus vulgaris, B. Bullous pemphigoid, C. Linear IgA disease, D. Dermatitis herpetiformis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The lesions in Linear IgA disease with a bimodal age distribution ie 60 yrs comprise of uicated plaques and papules, and annular, polycyclic lesions often with blistering around the edge, the string of pearls sign/cluster of jewels sign.', 'role': 'assistant'}]