This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Histology, Subject name: Anatomy
Hassall's corpuscles are seen in: 
Select and explain. 
A. Thymus, B. Spleen, C. Lymph node, D. Appendix
A: Thymus
Answer: A: Thymus 
Explanation: A - D.I Fiores Atlas of histology, p. 130