This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
Special visceral efferent doesn't include(2018) 
Select and explain. 
A. A) nucleus ambiguous, B. B) Dorsal nucleus of the Xth cranial nerve, C. C) Motor nucleus of Vth cranial nerve, D. D) Motor nucleus of VIIth cranial nerve
B: B) Dorsal nucleus of the Xth cranial nerve
Answer: B: B) Dorsal nucleus of the Xth cranial nerve 
Explanation: Special visceral efferent( purely motor) for the supply of muscles of facial expression, muscles of mastication and muscles of palate and pharynx, larynx(Nucleus ambiguous). Dorsal nucleus of vagus (parasympathetic): it is a mixed nucleus, being both motor (visceromotor and secretomotor) and sensory. General visceral efferent fibres arise in the dorsal nucleus of the vagus. Ref:- BD chaurasia volume 3, pg num:-288,289