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: Pathology
Birbeck’s granules in the cytoplasm are seen in: 
Select and explain. 
A. Langerhans cells, B. Mast cells, C. Myelocytes, D. Thrombocytes
A: Langerhans cells
Answer: A: Langerhans cells 
Explanation: Birbeck granules are rod Shaped/Tennis-racket shaped cytoplasmic organelles with a central linear density and a striated appearance.
They are diagnostic microscopic feature in Langerhans cell histiocytosis (Histiocytosis X)