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
Which of the following are X- linked recessive disorders: 
Select and explain. 
A. Marfan Syndrome, B. Phenylketonuria, C. Neurofibromatosis, D. Duchenne muscular dystrophy
D: Duchenne muscular dystrophy
Answer: D: Duchenne muscular dystrophy 
Explanation: D i.e. Duchenne muscular dystrophy