[单选] 一名73岁男子向他的初级保健医生诉说夜间溪流微弱且有四次夜尿。他对药物副作用非常敏感，因此不愿服药。体格检查发现轻度前列腺肥大。这种情况的治疗可能涉及使用下列哪一种药物来减少副作用？A 73-year-old man presents to his primary care physician complaining of a weak stream and nocturia four times at night． He is very sensitive to the medication side effects and is reluctant to take medications for this reason． Physical examination reveals a mildly enlarged prostate． Treatment of this condition may involve the use of which of the following agents to minimize side effects？