This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'Retinoblastoma gene is located on chromosome - \nSelect and explain. \nA. 6, B. 9, C. 13, D. 21', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Harshmohan textbook of pathology 7th edition RB gene is located on long arm chromosome 13. This is the first ever tumor suppressor gene identified and this has been amply studied..', 'role': 'assistant'}]