Sq. cell tumor of urinary bladder is due to -a) Stoneb) Schistosomiasisc) Chr. cystitisd) Diabetes mellitus: (A) ab, (B) bc, (C) abc, (D) bcd
Answer is C. Risk factors for squamous cell ca of bladder

Schistosoma haematobium
it's 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 infections
Bladder diverticula