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
Longest cranial nerve is 
Select and explain. 
A. Vagus, B. Trigeminal, C. Trochlear, D. Olfactory
A: Vagus
Answer: A: Vagus 
Explanation: The word "vagus" means wandering in Latin. This is a very appropriate name, as the vagus nerve is the longest cranial nerve. It runs all the way from the brain stem to pa of the colon. Ref - medscape.com