_____________ is not a form of muscular dystrophy

The correct option is Lunar dystrophy.

Muscular dystrophy refers to a group of genetic diseases characterized by progressive weakness and degeneration of the skeletal muscles that control movement. Let's analyze the given options to understand why Lunar dystrophy is the correct answer:
1. Duchenne muscular dystrophy (DMD): This is one of the most common and severe forms of muscular dystrophy, primarily affecting young boys. It is caused by a mutation in the gene that codes for the protein dystrophin.
2. Myotonic dystrophy: Also known as Steinert's disease, this is a form of muscular dystrophy characterized by myotonia (inability to relax muscles after vigorous effort) alongside muscle wasting and weakness.
3. Facioscapulohumeral dystrophy (FSHD): This form of muscular dystrophy initially affects the muscles of the face (facio-), shoulders (scapulo-), and upper arms (-humeral).
4. Lunar dystrophy: There is no medical condition or form of muscular dystrophy known as "lunar dystrophy." The term "lunar" relates to the moon and is not associated with muscle pathology.

Therefore, Lunar dystrophy is not a form of muscular dystrophy.