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: Pharmacology
[{'content': 'Which of the following is NOT an important/ frequent/well-known manifestation of an adverse drug reaction? \nSelect and explain. \nA. Agranulocytosis, B. Aplastic anaemia, C. Haemolysis, D. Leukaemia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]