David is writing a report on diseases of the excretory system. Choose the correct way to complete each sentence. Fill in the blanks

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is an inability to completely empty the bladder. It is an abnormal condition of urination characterized by poor urinary stream with intermittent flow, straining, a sense of incomplete voiding, and a delay between trying to urinate and the flow actually beginning. Because the bladder remains full, urinary retention may lead to complications, including urinary incontinence,
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, and a frequent need to urinate. The most extreme kind of urinary retention is complete
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, which is the absence of urination and a medical emergency.