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': 'In Langerhans cell histiocytosis, the characteristic abnormality seen on microscopy is - \nSelect and explain. \nA. Bibecks granules, B. Foamy macrophages, C. Giant cells, D. Plasma cells', 'role': 'user'}, {'content': 'Answer: A \nExplanation: . Bibecks granules', 'role': 'assistant'}]