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: Pathology
Severe pain after injury or sectioning of a peripheral sensory nerve is called: 
Select and explain. 
A. Complex regional pain syndrome., B. Neuralgia., C. Neuritis., D. Temporal arteritis.
A: Complex regional pain syndrome.
Answer: A: Complex regional pain syndrome. 
Explanation: Causalgia manifests as severe pain after injury or sectioning of a peripheral sensory nerve following a difficult extraction. The other names are complex regional pain syndrome and reflex sympathetic dystrophy syndrome.