During a psychiatric evaluation, the psychiatric-mental health nurse practitioner conducts a psychiatric review of systems (ROS) in which he reviews common psychiatric symptoms that may not have been elicited in the history of present illness (HPI). Which of the following questions is most likely designed to elicit a response for the system "mood"?

Choice A reason: Questions about sleep quality are designed to evaluate sleep disorders or secondary symptoms of mood or anxiety disorders, but they are not primary measures of mood. Choice B reason: Loss of interest or pleasure (anhedonia) directly assesses depressive symptoms and mood disturbance, making it the most accurate question for evaluating the mood system. Choice C reason: Difficulty controlling worry pertains to anxiety symptoms, not mood per se. Choice D reason: Frequent illness assesses somatic or immune-related issues, not mood.