13. A patient has trouble sleeping for long periods of time, sometimes has trouble coordinating his leg movements, and often exhibits aggressive behavior to hospital staff and other patients. You expect that one of the drugs prescribed to the patient may be inadvertently stimulating a diffusive modulatory system in the brain. For which of the following neuromodulators would you seek an agonistic interaction among the patient’s prescriptions?
A. Dopamine
B. Serotonin
C. Norepinephrine
D. Acetylcholine
E. Epinephrine