A nurse is caring for a client who is receiving morphine for pain. Which of the following findings indicates that the client is experiencing an adverse effect of the medication?

The correct answer is D: Urinary retention. Morphine is known to cause urinary retention as it can affect the smooth muscle tone of the bladder. This adverse effect can lead to the client experiencing difficulty or inability to urinate. Tachycardia (A), lacrimation (B), and hypertension (C) are not typically associated with morphine use and are more likely to be symptoms of other conditions or medications. Therefore, the presence of urinary retention should raise concerns as a potential adverse effect of morphine in this client.