This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Peripheral Nerve & Muscles, Subject name: Medicine
True about neuropraxia is: 
Select and explain. 
A. Blockage of axon, B. Physiological block, C. Incomplete transection of nerve, D. Complete transection of nerve
B: Physiological block
Answer: B: Physiological block 
Explanation: Ref: Current Therapy in Neurologic Disease, Volume L edited by Richard Tidball Johnson. John W. Griffin, Justin C. McArthur, Page 247Explanation:TYPES OF NERVE INJURYNeuropraxia:Physiological block of nerve conduction within an axon without any anatomical interruption.Example: Brachial plexus injury at birth which recovers spontaneously by 4-6 weeks.Axonemetesis:Anatomical interruption of the axon with no interruption of the connective tissue framework.Needs time for regrowth of axon to the target muscle.Scar formation will prevent regrowth.Takes many months to recover.Neurotmesis:Complete anatomical disruption of the axon and surrounding connective tissue.Complete nerve rupture.No chance of spontaneous recovery.Needs early surgical intervention.