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
[{'content': "Hassall's corpuscle is present in: \nSelect and explain. \nA. Tonsil, B. Thymus, C. Spleen, D. Lymph node", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. B. ThymusHassall's corpuscles are structures found in the medulla of the human thymus, formed from eosinophilic type VI epithelial reticular cells arranged concentrically. These concentric corpuscles are composed of a central mass, consisting of one or more granular cells, and of a capsule formed of epithelioid cells.", 'role': 'assistant'}]