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': 'Smoking is most commonly associated with:March 2013 \nSelect and explain. \nA. Liver carcinoma, B. Gall bladder, C. Urinary bladder carcinoma, D. Stomach carcinoma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C i.e. Urinary bladder carcinomaCauses of bladder carcinomaTobacco smoking is the main known contributor to urinary bladder cancer; in most populationsSmoking is associated with over half of bladder cancer cases in men and one-third of cases among women.Thiy percent of bladder tumors probably result from occupational exposure in the workplace to carcinogens such as benzidine.2-Naphthylamine, which is found in cigarette smoke, has also been shown to increase bladder cancer risk.Occupations at risk are bus drivers, rubber workers, motor mechanics, leather (including shoe) workers, blacksmiths, machine setters, and mechanics.Hairdressers are thought to he at risk as well because of their frequent exposure to permanent hair dyes.', 'role': 'assistant'}]