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': 'Which anaesthetic modality is to be avoided in sickle cell disease \nSelect and explain. \nA. General anaesthesia, B. Brachial plexus block, C. I.V. Regional Anaesthesia, D. Spinal', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. I.V. Regional Anaesthesia', 'role': 'assistant'}]