This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuro Ophthalmology, Subject name: Ophthalmology
All of them are true about the 4th nerve EXCEPT 
Select and explain. 
A. The only nerve to emerge from the dorsal aspect of brain, B. The only nerve to cross over to opposite side, C. It is the thickest cranial nerve, D. It has the fewest axons of any cranial nerve
C: It is the thickest cranial nerve
Answer: C: It is the thickest cranial nerve 
Explanation: The trochlear nerve has several features that make it unique from the other cranial nerves: Thinnest cranial nerve. Is the only nerve to exit from the dorsal surface of the brain. Is the only nerve in which all the lower motor neuron fibers decussate. Has the longest intracranial course. Has the smallest number of axons.