<prompt> Sq. cell tumor of urinary bladder is due to -a Stoneb Schistosomiasisc Chr. cystitisd Diabetes mellitusabbcabcbcd  <response>: Risk factors for squamous cell ca of bladderSchistosoma haematobiumits a risk factor for both TCC sq. cell ca, but more for sq. cell ca.Chronic irritation from urinary calculi, long term indwelling catheters, chronic urinary infectionsBladder diverticula 