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: Medicine
[{'content': 'A one year old boy presented with hepatosplenomegaly and delayed milestones. The liver biopsy and bone marrow biopsy revealed presence of histiocytes with PAS-positive Diastase-resistant material in the cytoplasm. Electron-microscopic examination of these histiocytes is most likely to reveal the presence of- \nSelect and explain. \nA. Birbeck granules in the cytoplasm, B. Myelin figures in the cytoplasm, C. Parallel rays of tubular structures in lysosomes, D. Electron dense deposit in the mitochondria', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]