This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Intracellular Accumulations, Subject name: Pathology
[{'content': 'Shape of birbicks granules is - \nSelect and explain. \nA. Hockeystick, B. Bat, C. Ball, D. Tennis racket', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Tennis racket o Under the electron microscope, Birbeck granules have a pentalaminar, rod!ike, tubular appearance and sometimes a dilated terminal end resembling tennis-racket appearance.", 'role': 'assistant'}]