Final answer:
In patients with a history of BPH and a cold, the nurse should question the use of decongestants as these medications can exacerbate urinary symptoms.
Step-by-step explanation:
The nurse should question the client with a history of BPH about the use of decongestants because these medications can exacerbate urinary symptoms in patients with BPH. Decongestants work by constricting blood vessels, which can also cause constriction of the prostate gland, leading to urinary retention. This can be especially problematic in clients with a cold who are already experiencing difficulty voiding. By identifying the use of decongestants, the nurse can determine if the medication is contributing to the client's inability to void and take appropriate action.