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: Medicine
[{'content': 'Lack of Leucocyte adhesion molecules (LAM) is associated with - \nSelect and explain. \nA. Delayed closure of umblical cord, B. Normal chemotaxis, C. Compliment opsinization, D. Neutropenia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]