This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Medicine
[{'content': "All of the following are X-linked disorders except \nSelect and explain. \nA. Emery-Dreifuss dystrophy, B. Becker's dystrophy, C. Duchenne's dystrophy, D. Myotonic dystrophy", 'role': 'user'}, {'content': 'Answer: D \nExplanation: . *myotonic dystrophy-autosomal dominant ;expanded triplet repeat chromosome 19q *duchenne dystrophy-x linked;deletion in dystrophin gene Xp21 *becker -Xlinked ;deletion in dystrophin gene Xp21 *emery dreifuss dystrophy X linked recessive ;mutations in emerin gene . Ref Harrison20th edition pg 2345', 'role': 'assistant'}]