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Which symptom is consistent with urinary retention associated with benign prostatic hyperplasia?

  1. Nighttime elevation of heart rate

  2. Increased libido

  3. Weak urinary stream

  4. Inability to concentrate

The correct answer is: Weak urinary stream

The symptom of a weak urinary stream is commonly associated with urinary retention due to benign prostatic hyperplasia (BPH). BPH leads to the enlargement of the prostate gland, which can obstruct the flow of urine from the bladder. This obstruction typically results in the difficulty of initiating urination and a weak or intermittent urinary stream. As the condition progresses, individuals may also experience the sensation of incomplete bladder emptying and increased post-void residual volume, further contributing to urinary retention. The other symptoms presented do not have a direct correlation with urinary retention related to BPH. For instance, nighttime elevation of heart rate does not typically arise from urinary issues, nor does increased libido. Additionally, the inability to concentrate may stem from a variety of other medical conditions, including psychological stress or fatigue, rather than being a direct symptom of urinary retention. Thus, a weak urinary stream is a hallmark symptom of the complications associated with BPH, making it the correct choice in this case.