This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous system, Subject name: Physiology
The first reflex to return after recovery from spinal shock is 
Select and explain. 
A. Stretch reflex, B. Flexor reflex, C. Stepping reflex, D. Postural antigravity reflex
B: Flexor reflex
Answer: B: Flexor reflex 
Explanation: Recovery of reflex excitability is due to the development of denervation hypersensitivity to the mediators released by the remaining spinal excitatory endings and the growing of collaterals from existing neurons with the formation of additional excitatory ending on interneurons and motor neurons. Flexor reflexes return first, and to elicit flexor reflex painful stimuli is required. The first reflex which usually appears is Babinski's reflex (i.e. Babinski's sign is positive). Ref: guyton and hall textbook of medical physiology 12 edition page number:774,775,776