This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Birbeck's granules in the cytoplasm are seen in 
Select and explain. 
A. Langerhan's cells, B. Mast cell, C. Myelocytes, D. Thrombocytes
A: Langerhan's cells
Answer: A: Langerhan's cells 
Explanation: ref Robbins 9/e p622 Birbeck granules, also known as Birbeck bodies, are rod shaped or "tennis-racket" cytoplasmic organelles with a central linear density and a striated appearance. First described in 1961 (where they were simply termed "characteristic granules"), they are solely found in Langerhans cells.