The PMHNP has just diagnosed a 7-year-old boy with attention-deficit hyperactivity disorder (ADHD). The boy's mother is adamant she does not want him to take medication, and she asks the PMHNP to tell her about biofeedback. Which of the following is the best response?

Choice A reason: Biofeedback provides real-time feedback of physiological signals (heart rate, muscle tension, etc.) to help patients gain voluntary control over bodily functions, which can help manage ADHD symptoms without medication. Choice B reason: Stimulating the olfactory system is unrelated to biofeedback. Choice C reason: Manipulating energy points refers to alternative medicine approaches, not biofeedback. Choice D reason: Blood circulation and lymph flow are unrelated to the mechanism of biofeedback.