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
All are seen in cerebral herniation, except : 
Select and explain. 
A. Neck stiffness, B. Loss of consciousness, C. Pupil dilatation, D. Autonomic disturbances
A: Neck stiffness
Answer: A: Neck stiffness 
Explanation: A i.e. Neck stiffnessNeck stiffness is seen in those condition in which the meninges are irritated e.g. meningitis.Herniation /ConingRefers to displacement of brain tissue away from a mass and into a compament that it normally does not occupy.UncalHerniationCentral transtentorialHerniationTransfalcialHerniationForaminalHerniationDisplacement of antero medial temporal gyrus(uncus) into the tentorial opening l/tSequential Compression of:Symmetric downward movement of upperthalamic region through tentorial opening 1/tSequential Compression of:Displacement ofcingulate gyrusunder the falxDownwardforcing of thecerebellar tonsil- Ipsilateral III cranial nv.- Upper midbrain (first)and across theinto the- Contralateral brainstem (later)- Pons (later)midlineforamen- Whole brainstem (eventually)- Medulla (finally) magnum.Physical Sign:Physical sign:EarlyLaterEventuallyEarlyLaterEventually- I/L dilated- Babinski- Tetraparesis- Erratic- Cheyne- FixedpupilQsignQ- B/L fixedrespirationstokesdilated- Sign of- I/Ldilated pupil- Small reactiverespirationpupilsupraten-hemiplegia- Erraticpupil- Decoicate- Decerebratetorial masslesion- AutonomicdisturbanceQrespiration- Death- B/L extensorplanterQrigidityposturing