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
Delayed separation of umbilical cord stump is seen in? 
Select and explain. 
A. Chediak Higashi syndrome, B. Chronic granulomatous disease, C. Leukocyte adhesion deficiency, D. All of the above
C: Leukocyte adhesion deficiency
Answer: C: Leukocyte adhesion deficiency 
Explanation: Usually umbilical cord separates within 1 week after birth. In LAD-1 separation is delayed.