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': 'The histologic hallmark of langerhan cells is? \nSelect and explain. \nA. Dendritic cell processes, B. Giant mitochondria, C. Birbeck granules, D. Eosinophilic granules', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Birbeck granules", 'role': 'assistant'}]