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': 'Neutrophil hypomotility syndrome is due to \nSelect and explain. \nA. Defective actin polymerization, B. Deficiency of leukocyte integrins, C. Defect in free radical production, D. Absence of actin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]