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: Physiology
[{'content': 'Major basic protein is secreted by? \nSelect and explain. \nA. Neutrophil, B. Basophil, C. Platelet, D. Eosinophil', 'role': 'user'}, {'content': "Answer: D \nExplanation: Eosinophil REF: Harrison's 17th ed chapter 61 The distinctive feature of the red-staining (Wright's stain) eosinophil granule is its crystalline core consisting of an arginine-rich protein (major basic protein) with histaminase activity, impoant in host defense against parasites", 'role': 'assistant'}]