This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Brainstem, cerebellum and ventricles, Subject name: Anatomy
"Red nucleus" is present at 
Select and explain. 
A. Base of pons, B. Midbrain, at level of superior colliculus, C. Midbrain, at level of inferior colliculus, D. Medial medulla
B: Midbrain, at level of superior colliculus
Answer: B: Midbrain, at level of superior colliculus 
Explanation: The red nucleus is diagnostic of midbrain division at the level of the superior colliculus; it lies between the occulomotor nucleus (CN III) and the substantia nigra. fig:- crossection at the level of Superior colliculus Midbrain