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': 'Hassals corpuscles are seen in : \nSelect and explain. \nA. Thymus, B. Spleen, C. Lymph node, D. Appendix', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Thymus', 'role': 'assistant'}]