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: Pathology
[{'content': 'The incidence of which of the following cancers has increased in the past 4 decades - \nSelect and explain. \nA. Carcinoma of pancreas, B. Carcinoma of stomach, C. Carcinoma of lung, D. Carcinoma of colon', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]