This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Pathology
[{'content': 'Shape of berbicks granules is - \nSelect and explain. \nA. Hockey stick, B. Bat, C. Ball, D. Tennis racket', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Birbeck granules are seen in langerhans cell histiocytosis. These are rod shaped structures having dilated tennis racket like terminal end. Reference : Harsh Mohan textbook of pathology, 7th edition.Pg no.365', 'role': 'assistant'}]