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: None', 'role': 'assistant'}]