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: Surgery
[{'content': 'Transitional cell carcinoma of bladder is associated with -a) Schistosomiasisb) Naphthylaminec) Smokingd) Tuberculosis of bladder \nSelect and explain. \nA. ab, B. abc, C. acd, D. bcd', 'role': 'user'}, {'content': "Answer: B \nExplanation: Risk factors for Transitional cell ca of Bladder\n\nCigarette smoking - is the main etiological factor and accounts for about 50% of bladder cancers.\nOccupational exposures to chemicals\n\n\nthe following compounds may be carcinogenic \n\n2 naphthylamine\xa0- combustion gases and soot from coal\n4-aminobiphenyl\xa0- chlorinated aliphatic hydrocarbons\n4-nitrobiphenyl\xa0- certain aldehydes such as acrolein\n4-4-diaminobiphenyl (benzidine) - aniline dyes\n2-ami-l-naphthol\nOccupation reported to be associated with increased risk of bladder cancer\n\nautoworkers - metal workers\npainters - textile worker\ntruck drivers\xa0- dye workers\ndrill press operator - petrol workers\nleather workers \xa0- rodent exterminators & sevage workers leather workers\n\n\nSchistosoma haemotobium - it's a risk factor for both transitional cell ca & squamous cell ca.\nDrugs such as phenacetin & chlornaphazine\nCyclophosphamide therapy\nPelvic irradiation\n\n\nVitamin A supplements appear to be protective.", 'role': 'assistant'}]