This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lysosomal Storage Diseases, Subject name: Pediatrics
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 cytoplasm. Electron microscopic examination of these histiocytes is most likely to reveal the presence of: 
Select and explain. 
A. 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
C: Parallel rays of tubular structures in lysosomes
Answer: C: Parallel rays of tubular structures in lysosomes 
Explanation: Given scenario suggests Gaucher disease, in which glucocerebroside in lysosomes seen. Birbeck granules in the cytoplasm- seen in histiocytosis X