This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
The following are X-linked disorders except 
Select and explain. 
A. Cystic fibrosis, B. Hemophilia A, C. Duchenne muscular dystrophy, D. Fragile X syndrome
A: Cystic fibrosis
Answer: A: Cystic fibrosis 
Explanation: X-linked Recessive Inheritance Hemophilia A Duchenne/Becker muscular dystrophy Fragile X syndrome Autosomal Recessive Inheritance Cystic fibrosis Phenylketonuria Tay-Sachs disease (Robbins Basic Pathology,9th edition,pg no. 219)