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: Anatomy
Hassal's corpuscles are seen in: 
Select and explain. 
A. Thymus, B. Spleen, C. Bone marrow, D. Lymph node
A: Thymus
Answer: A: Thymus 
Explanation: Hasal's corpuscles/thymic corpuscles are structures found in the medulla of the human thymus, formed from type VI epithelial reticular cells.They are named for Ahur Hill Hassall, who discovered them in 1849.