<prompt> In spinal anaesthesia the segmental level of:Sympathetic block is lower than the sensory blockSympathetic block is higher than the sensory blockMotor block is higher than the sensory blockSympathetic, motor and sensory block has the same level  <response>: 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. 