<prompt> A 45-years-old man who works in textile company visited hospital for routine health check-up. He prepares dyes in company from last 18 years. Which of the following investigation would you recommend for this patient?Pulmonary function testsLiver function testsUrine examinationComplete blood count.  <response>: Dye stuffs dyeing industries, rubber, gas electric cable industries are associated with carcinoma of bladder transitional cell carcinoma. Bladder cancer is caused by aromatic amines, which are metabolized in the body excreted in the urine. Possible bladder carcinogens are: Beta-naphthylamines, benzidine, para-amino-diphenyl, auramine magenta. In this case pt. is exposed to dyes for long duration and is at risk for developing bladder cancer. So, urine tests should be done to see if there is any hematuria, which is the mc symptom of bladder cancer. 