Final answer:
The true statement concerning acute bacterial prostatitis is that perineal pain with defecation is a common complaint. Gram-negative bacteria, not Gram-positive organisms, are the most common cause, and cephalosporins are not the first-line therapy; fluoroquinolones are typically used instead.
Step-by-step explanation:
Concerning acute bacterial prostatitis, the most common cause of infection is Gram-negative bacteria, such as Escherichia coli. Therefore, option a) is not correct as Gram-positive organisms are not the most common cause. For the treatment of bacterial infections of the urinary system, including prostatitis, the length of antibiotic therapy is usually longer than 1 week, making option b) incorrect. Perineal pain with defecation can indeed be a common complaint among patients with acute bacterial prostatitis, which makes option c) correct. First-line therapy for bacterial prostatitis commonly includes fluoroquinolones like ciprofloxacin, not cephalosporins, making option d) incorrect.