Which of the following conditions indicates the inability to urinate?

Anuria refers to a complete inability to produce urine, which is a critical condition often associated with kidney failure or severe dehydration. In this state, the body fails to excrete waste and excess fluids, leading to various complications if not addressed.

Oliguria, on the other hand, describes a condition where urine output is significantly reduced but not entirely absent. Polyuria indicates an excessive quantity of urine output, typically seen in conditions like diabetes mellitus. Dysuria refers to painful urination which does not describe an inability to urinate but rather discomfort associated with urination. Thus, anuria is the condition that specifically denotes the absence of urine production.