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Select the correct statement regarding the specific disorder of muscular or skeletal system :

A) Myasthenia gravis - Autoimmune disorder which inhibits sliding of myosin filaments.

B) Gout - inflammation of joints due to extra deposition of calcium.

C) Muscular dystrophy - age related shortening of muscles.

D) Osteoporosis - decrease in bone mass and higher chances of fractures with advancing age.