This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Brain , Subject name: Anatomy
The nucleus ambiguus is shared by all of the following cranial nerves except 
Select and explain. 
A. IX, B. X, C. XI, D. XII
D: XII
Answer: D: XII 
Explanation: Cranial pa of nucleus ambiguus gives fibers to IX, X and the cranial root of XI nerve. The caudal pa of this nucleus gives fibers to the spinal root of XI nerveRef: Chaurasia; Volume 3; 6th edition; Page no: 342