This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax, Subject name: Anatomy
[{'content': "Hassal's corpuscles are seen in \nSelect and explain. \nA. Thymus, B. Thyroid, C. Parathyroid, D. Spleen", 'role': 'user'}, {'content': "Answer: A \nExplanation: Corpuscles of hassall present in the medulla of thymus Formed from eosinophilic epithelial reticular cells arranged concentrically INDERBIR SINGH'S TEXTBOOK OF HUMAN HISTOLOGY SEVENT EDITION PAGE NO139", 'role': 'assistant'}]