<prompt> 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;Birbeck granules in the cytoplasmMyelin figures in the cytoplasmParallel rays of tubular structures in lysosomesElectron dense deposit in the mitochondria  <response>: Parallel rays of tubular structures in lysosomes 