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': 'Which of the following are most numerous in human blood \nSelect and explain. \nA. Neutrophils, B. Eosinophils, C. Basophils, D. Monocytes', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Normally, human blood contains 4000 to 11,000 white blood cells per microliter. Of these, the granulocytes (polymorphonuclear leukocytes, PMNs) are the most numerous. Among these neutrophils are the most common ones.', 'role': 'assistant'}]