<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A professional musician visits his physician after a morning concert. He complains of painless swelling in his right cheek when he plays his tuba. Physical examination of the patient reveals slight facial asymmetry due to minor swelling on the right side of the face. The skin over the swelling is smooth without any secondary changes. Palpation reveals a soft and non-tender swelling. The oral opening is normal without any trismus. Further examination reveals swelling of the left buccal mucosa extending from the first to the third molar. Bedside ultrasound shows small areas of high echogenicity consistent with pneumoparotid. Which nerve is associated with motor function to prevent air from entering the affected duct in this patient?? A: V2 Maxillary nerve, B: V3 Mandibular nerve, C: CN VII Zygomatic branch, D: CN VII Buccal branch, E: CN VII Marginal mandibular branch,  <response>: This is a clinical vignette describing a musician with painless swelling in his right cheek when playing his tuba. The key findings are swelling on the right side of the face, smooth skin, soft and non-tender swelling, swelling of the left buccal mucosa, and ultrasound findings of pneumoparotid air within the parotid gland. The question asks which nerve is associated with motor function to prevent air from entering the affected duct. This implies the nerve that controls the parotid duct to prevent air from entering during playing the tuba. Of the choices given, the buccal branch of the facial nerve CN VII innervates the buccinator muscle which controls the parotid duct. The other branches listed innervate different regions of the face but not the buccinator muscle specifically.D: CN VII Buccal branch 