Comparing Tay-Sachs disease and Duchenne's muscular dystrophy?

When comparing Tay-Sachs disease and Duchenne's muscular dystrophy, which of the following do both disorders have in common?

A. They both involve malfunction of the nervous system
B. They both involve mutations in which fat replaces normal tissue
C. They both lead to death in the first few years of life
D. They both are disorders that are equally distributed in the general population.

I believe that it would be A, because C is not right, adults with Tay, can live with it. Only Tay involves fat replacing tissue, so B is out. Tay Sachs has a prevalence of about 1 in 300 and DMD 1-3000 in males, so they don't add up.

Tags

　　Myopia 　　Myopathies 　　Myocardial Infarction 　　Myeloproliferative Disorders 　　Myelodysplastic Syndromes 　　Myasthenia Gravis 　　Muscular Dystrophy 　　Muscle Strain 　　Muscle Disorders 　　Mumps 　　Multiple Sclerosis 　　Multiple Myeloma 　　Multiple Endocrine Neoplasia

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