Which forms of muscular dystrophy are listed as examples in the material?

• A. Duchenne (DMD), Becker (BMD), Limb-Girdle (LGMD)
• B. Duchenne Muscular Dystrophy, Amyotrophic Lateral Sclerosis, Myasthenia Gravis
• C. Limb-Girdle (LGMD), Myotonic Dystrophy, Emery-Dreifuss Muscular Dystrophy
• D. Myotonic Dystrophy, Becker (BMD), Duchenne (DMD)

Answer: (A)

This question tests recognition of which muscular dystrophy forms are used as example categories in the material. The material lists Duchenne Muscular Dystrophy, Becker Muscular Dystrophy, and Limb-Girdle Muscular Dystrophy as the cited examples. Duchenne and Becker are dystrophinopathies caused by mutations in the DMD gene, with Duchenne typically more severe and starting earlier in life, while Becker is milder and starts later. Limb-Girdle Muscular Dystrophy refers to a group of dystrophic conditions that mainly affect proximal muscles around the hips and shoulders, illustrating another major MD category. The other options mix in diseases that are not muscular dystrophy or include MD forms not presented as examples in the material. So the set that matches the material’s examples is the one with Duchenne, Becker, and Limb-Girdle muscular dystrophy.