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
[{'content': 'A patient in ICU was on invasive monitoring with intra arterial canulation through right radial artery for last 3 days. Later he developed swelling and discolouration of right hand. The next line of management is – \nSelect and explain. \nA. Stellate ganglion block, B. Paravertebral block, C. Radial Nerve block, D. Celiac plexus block', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Swelling and discoloration of hand after 3 days radial artery cannulation suggests arterial thrombosis.\nRadial artery cannulation can cause thrombosis of radial artery and ischemic damage. Aggressive management, e.g. brachial plexus block or stellate ganglion block may be required to avoid permanent damage.', 'role': 'assistant'}]