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: Medicine
[{'content': 'All of the following statements are true about sickle cell disease except - \nSelect and explain. \nA. Patient may require frequent blood transfusions, B. Acute infection is the most common cause of mortality before 3 years of age, C. There is positive correlation between conc. HBS and polymerization of HBS., D. Patient presents early in life before 6 months of age', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]