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

  • A
    Muscular dystrophy - age-related shortening of muscles.
  • B
    Osteoporosis - decrease in bone mass and higher chance of fractures with advancing age.
  • C
    Myasthenia gravis - Autoimmune disorder which inhibits sliding of myosin filaments.
  • D
    Gout - inflammation of joints due to extra deposition of calcium.

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The standard reduction potentials of $Zn^{2+}|Zn$,$Cu^{2+}|Cu$ and $Ag^{+}|Ag$ are respectively $-0.76 \ V$,$0.34 \ V$ and $0.8 \ V$. The following cells were constructed:
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