This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anaesthesia, Subject name: Pharmacology
In spinal anaesthesia the segmental level of: 
Select and explain. 
A. Sympathetic block is lower than the sensory block, B. Sympathetic block is higher than the sensory block, C. Motor block is higher than the sensory block, D. Sympathetic, motor and sensory block has the same level
B: Sympathetic block is higher than the sensory block
Answer: B: Sympathetic block is higher than the sensory block 
Explanation: Spinal anaesthesia creates a zone of differential blockade in which sympathetic fibres are blocked two segments higher and motor fibres are blocked two segments lower than the level of sensory block.