A 22-Year-Old Man Comes to the Emergency Department Due to Sudden-Onset

A 22-year-old man comes to the emergency department due to sudden-onset pain and stiffness on one side of his neck.  He was diagnosed with a psychiatric disorder 2 days ago and has been adherent with his newly prescribed medication.  For the past few months, the patient has heard voices telling him to quit his job, and he believes that his girlfriend's parents are monitoring his sexual thoughts with a special device.  He has been socially withdrawn and has difficulty showering regularly.  Vital signs are within normal limits.  The head is tilted to one side and cannot be straightened without considerable pain.  The most likely cause of this patient's symptoms is antagonism of which of the following receptors?

A) Alpha-1 adrenergic
B) Dopaminergic D2
C) GABA-A
D) Histaminergic H1
E) Muscarinic M1
F) Serotonergic 5-HT2A

Correct Answer:

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