Acondition that affects the urinary system and can be fatal is a. a stomach ulcer b. kidney failure c. irritable bowel syndrome d. lactose intolerance

The correct answer is B. Kidney failure.

Kidneys are a part of the urinary tract system. Your kidneys remove wastes and extra fluid from your body. Your kidneys also remove acid that is produced by the cells of your body and maintain a healthy balance of water, salts, and minerals such as sodium, calcium, phosphorus, and potassium in your blood.  If your kidneys aren't functioning properly balance, nerves, muscles, and other tissues in your body may not work normally.