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
only nerve that does not have ventral attachment at the base of the brain: 
Select and explain. 
A. Trochlear, B. Trigeminal, C. Optic, D. Occulomotor
A: Trochlear
Answer: A: Trochlear 
Explanation: All cranial nerves have ventral attachments at the base of the brain except trochlear nerve which has dorsal attachment to base of brain.