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
Sever congenital neutropenia syndrome is also known as: 
Select and explain. 
A. Kostmann syndrome., B. Chediak higashi syndrome., C. Aldrich syndrome., D. Fanconi syndrome
A: Kostmann syndrome.
Answer: A: Kostmann syndrome. 
Explanation: None