Q: Given a context passage, generate a question from the passage such that its answer is shortest continous span from the passage.
Dystrophic myotonia is a sufficiently rare disease inherited mainly by the autosomal dominant type. Clinical picture is characterized by the myotonic, myopathic, and endocrine-autonomic syndrome. A clinical, genetic, and electromyographic study was carried out to elucidate the problem of this condition inheritance, its intra- and interfamilial clinical polymorphism, and effects of environmental factors on its course and outcomes.
A:
How is myotonic dystrophy inherited?