Final answer:
The three things lost in urine when it stands at room temperature are glucose, urea, and creatinine, due to bacterial breakdown and chemical changes.
Step-by-step explanation:
The question asks which three things are lost if urine is allowed to stand at room temperature. When urine is not analyzed promptly, certain changes can occur due to the proliferation of bacteria and the breakdown of some substances within the urine. The correct answer to this question is that the three things lost if the urine stands at room temperature are: glucose, urea, and creatinine (Option A). These compounds can be broken down by bacteria that proliferate in urine left at room temperature. Glucose may be consumed by bacteria, while urea can be broken down into ammonia, increasing the pH and potentially altering results. Creatinine can also be broken down over time when urine is not stored properly.