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: Anaesthesia
In spinal anesthesia which fibers are affected earliest? 
Select and explain. 
A. Sensory, B. Motor, C. Sympathetic preganglionic, D. Vibration
C: Sympathetic preganglionic
Answer: C: Sympathetic preganglionic 
Explanation: Sympathetic preganglionic REF: Morgan 3rd e p-260 Order of blockade in spinal anesthesia: Autonomic preganglionic > Temperature > Prick > Pain > Touch > Pressure > Motor > Vibration