The correct answer to the question is option 1: glucose. In diabetes mellitus, the body is unable to properly regulate blood glucose levels. As a result, the blood glucose level becomes excessively high, and the kidneys try to remove this excess glucose through urination. To counteract the high blood glucose levels, the man suffering from diabetes mellitus may drink water more frequently to help eliminate the excess glucose from the blood. By increasing urine production, water helps to flush out the excess glucose from the body. It is important for individuals with diabetes to stay hydrated and manage their blood glucose levels to prevent complications.