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: Physiology
In transtentorial herniation, a pa of the brain is displaced from the supratentorial to the infratentorial compament through the tentorial opening. It results in all of the following, EXCEPT: 
Select and explain. 
A. Cheyne stokes respiration, B. Decerebration, C. Ipsilateral hemiparesis, D. Ipsilateral oculomotor paresis
C: Ipsilateral hemiparesis
Answer: C: Ipsilateral hemiparesis 
Explanation: The uncus (on the medial aspect of the temporal lobe) herniates under the tentorium cerebelli. The uncus can compress the oculomotor nerve (CN III), compromising the parasympathetic fibers and resulting in ipsilateral pupillary dilation with associated ophthalmoplegia ("down and out"). Cheyne-Stokes respirations are commonly seen with mesial temporal transtentorial herniation. If the uncus is forced fuher medially, it compresses the cerebral peduncle, producing contralateral hemiparesis. After the brain herniates, the patients are decerebrate and comatose, have fixed and dilated pupils, and eye movements are absent. Ref: Cowan J.A., Thompson B. (2010). Chapter 36. Neurosurgery. In G.M. Dohey (Ed), CURRENT Diagnosis & Treatment: Surgery, 13e.