This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S., Subject name: Pediatrics
Langerhans cell shows which of these? 
Select and explain. 
A. Badminton racquet appearance, B. CD100a, C. MPO +, D. Birbeck's granules
D: Birbeck's granules
Answer: D: Birbeck's granules 
Explanation: d. Birbeck's granules(Ref: Nelson's 20/e p 2484-2489; Ghai 8/e p 620-623)Tennis racquet and not badminton racquet appearance is seen in EM of LCH; LCH is positive for CD1a and S100.