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': 'A one year old boy presented withhepatosplenomegaly and delayed milestones. Theliver biopsy and bone marrow biopsy revealedpresence of histiocytes with PAS-positive Diastaseresistantmaterial in the cytoplasm. Electronmicroscopicexamination of these histiocytes is mostlikely 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: Parallel rays of tubular structures in lysosomes', 'role': 'assistant'}]