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
Genetic anticipation is characteristic of: 
Select and explain. 
A. Myotonic dystrophy, B. Beckers muscular dystrophy, C. Duchenne muscular dystrophy, D. Emery-Dreifuss muscular dystrophy
A: Myotonic dystrophy
Answer: A: Myotonic dystrophy 
Explanation: Genetic Anticipation refers to the progressive increase in severity of an illness as it manifests in its transmission from parent to child, occurring in a more severe form and at an earlier age with succeeding generations. It is more commonly seen in trinucleotide repeat disorders. Classical examples are Huntington's Disease - CAG Myotonic Dystrophy - CTG Dyskeratosis congenita - TTAGGG (telomere repeat sequence) Fragile X syndrome - CGG Crohn's disease Behcet's disease Ref: Genetic Instabilities and Neurological Diseases, Second Edition, edited by Robe D. Wells, Tetsuo Ashizawa, 2nd Edition, Page 56.