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
Hassall's corpuscles are seen in 
Select and explain. 
A. Thymus, B. Spleen, C. Lymph node, D. Appendix
A: Thymus
Answer: A: Thymus 
Explanation: Corpuscles of Hassall - These are small rounded structures present in the medulla of the thymus. Each corpuscle has a central core formed by epithelial cells that have undergone degeneration. These cells ultimately form a pink staining hyaline mass. Around this mass there is a wall formed by concentrically arranged epithelial cells. These cells also stain bright pink with haematoxylin and eosin. The central mass of the corpuscle may also contain degenerating macrophages. REF : Inderbir Singh's Textbook of Human Histology, seventh edition, pg.no.,139.