Tetany
Botulism
Muscular dystrophy
Myasthenia gravis
Correct option is Muscular dystrophy. Progressive degeneration of skeletal muscle mostly due to genetic disorder is muscular dystrophy whereas tetany is muscular spasm due to low calcium in body fluid. Myasthenia gravis is an auto immune disorder leading to paralysis of skeletal muscles. Botulism is a rare and dangerous type of food poisoning caused by the bacterium Clostridium Botulinum. So, the correct answer is 'Muscular dystrophy'.