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
[{'content': "Hassal's corpuscles are seen in: \nSelect and explain. \nA. Thymus, B. Spleen, C. Bone marrow, D. Lymph node", 'role': 'user'}, {'content': "Answer: A \nExplanation: 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.", 'role': 'assistant'}]