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
[{'content': 'In sickle cell anaemia, there is \nSelect and explain. \nA. 75 to 100% haemoglobin, B. 10 to 20% haemoglobin, C. 20 to 30% haemoglobin, D. 50 to 60% haemoglobin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]