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: Surgery
[{'content': 'Stellate ganglion block is useful in: \nSelect and explain. \nA. Sudeck osteodystrophy, B. Compound palmar ganglion, C. Tenosynovitis, D. Osteoahritis of first CMC joint', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Sudeck osteodystrophy', 'role': 'assistant'}]