<prompt> Transitional cell carcinoma of bladder is associated with -a Schistosomiasisb Naphthylaminec Smokingd Tuberculosis of bladderababcacdbcd  <response>: Risk factors for Transitional cell ca of BladderCigarette smoking - is the main etiological factor and accounts for about 50 of bladder cancers.Occupational exposures to chemicalsthe following compounds may be carcinogenic 2 naphthylamine - combustion gases and soot from coal4-aminobiphenyl - chlorinated aliphatic hydrocarbons4-nitrobiphenyl - certain aldehydes such as acrolein4-4-diaminobiphenyl benzidine - aniline dyes2-ami-l-naphtholOccupation reported to be associated with increased risk of bladder cancerautoworkers - metal workerspainters - textile workertruck drivers - dye workersdrill press operator - petrol workersleather workers - rodent exterminators sevage workers leather workersSchistosoma haemotobium - its a risk factor for both transitional cell ca squamous cell ca.Drugs such as phenacetin chlornaphazineCyclophosphamide therapyPelvic irradiationVitamin A supplements appear to be protective. 