Which medical professional diagnoses and treats diseases of the kidney, bladder, or urinary system?

The urologist is the medical professional who specializes in diagnosing and treating diseases related to the kidneys, bladder, or urinary system. Their focus includes a variety of conditions such as urinary tract infections, kidney stones, bladder control issues, and prostate problems, among others. Urologists perform surgeries and procedures to manage these conditions, and they are trained to understand how the urinary system interacts with the male and female reproductive systems, adding to their specialty.

The other professions listed do not focus on the same area of health care. Pediatricians concentrate on the health of children and their developmental stages rather than specific organ systems. Morticians deal with the preparation of deceased individuals for burial or cremation, which is unrelated to medical diagnosis or treatment. Physiatrists specialize in physical medicine and rehabilitation, focusing on restoring function after injury or illness, but do not specifically address urinary and kidney conditions. Therefore, the correct answer identifies the specialist most directly involved with the urinary system and its related diseases.