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
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- 
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: None