This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Largest cranial nerve 
Select and explain. 
A. Vagus, B. Trochlear, C. Trigeminal, D. Olfactory
C: Trigeminal
Answer: C: Trigeminal 
Explanation: SOME KEY FACTS ABOUT CRANIAL NERVES 

Trigeminal is the largest cranial nerve.
Vagus nerve is with vague or extensive distribution.
Olfactory is the smallest cranial nerve.

iv) Trochlear nerve shows largest intracranial course.
       v) Buccal nerve is the only sensory branch of anterior division of mandibular nerve
       vi) Smallest branch of trigeminal nerve is ophthalmic. 
       vii) Smallest of three terminal branches of opthalmic nerve is lacrimal nerve and frontal nerve is largest terminal branch of opthalmic nerve.