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
All are stages of anaesthesia except – 
Select and explain. 
A. Analgesia, B. Allodynia, C. Delirium, D. Surgical anesthesia
B: Allodynia
Answer: B: Allodynia 
Explanation: Stages of anaesthesia are :- Stage of analgesia (stage 1), stage of delirium or excitement (stage 2), stage of surgical anesthesia (stage 3) and stage of medullary paralysis (stage 4).