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': 'Which is not the classical feature of primary myelofibrosis \nSelect and explain. \nA. Tear Drop RBCs, B. Leucocrythroblast, C. Abnormal megalcaryocytes, D. Biconcavve RBCs', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Solution:\nWhen RBCs are Passing through splenic Circulation and fibrotic area biconcave RBCs becomes Tear Drop RBCs.', 'role': 'assistant'}]