This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Regional anaesthesia, Subject name: Anaesthesia
[{'content': 'Most commonly used approach to brachial Plexus block? \nSelect and explain. \nA. Interscalene, B. Supraclavicular, C. Infraclavicular, D. Axillary', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Supraclavicular is the most commonly used approach to brachial Plexus block.The supraclavicular approach to the brachial plexus characteristically is associated with a rapid onset of anaesthesia and a high success rate.The supraclavicular approach has more even distribution of local anaesthesia.', 'role': 'assistant'}]