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: Pathology
[{'content': 'Birbeck’s granules in the cytoplasm are seen in: \nSelect and explain. \nA. Langerhans cells, B. Mast cells, C. Myelocytes, D. Thrombocytes', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Birbeck granules are rod Shaped/Tennis-racket shaped cytoplasmic organelles with a central linear density and a striated appearance.\nThey are diagnostic microscopic feature in Langerhans cell histiocytosis (Histiocytosis X)', 'role': 'assistant'}]