This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Characteristics and Epidemiology of Neoplasia, Subject name: Pathology
[{'content': 'Leiomyosarcoma most common age group is - \nSelect and explain. \nA. 20 - 40 years, B. 30 - 50 years, C. 40 - 60 years, D. 50 - 70 years', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., 40 - 60 years o Leiomyosarcomas occur both before and after menopause, with a peak incidence at 40 to 60 years of age.", 'role': 'assistant'}]