Assertion (A) : Progressive degeneration of skeletal muscle mostly due to genetic disorder is muscular dystrophy.
Reason (R) : Rapid spasms in skeletal muscle are due to low Ca⁺⁺ in body fluid is tetany.

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Both A and R are true and R is the correct explanation of A.

Both A and R are true and R is not the correct explanation of A.

A is true, but R is false.

A is false, but R is true.

answer is B.

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Detailed Solution

Both A and R are true and R is not the correct explanation of A.

Assertion (A) is correct. Muscular dystrophy is indeed characterised by progressive degeneration of skeletal muscle, often due to genetic disorders that result in abnormal or inadequate production of proteins necessary for muscle structure and function.

Reason (R) is also correct. Tetany refers to a condition characterised by sustained, involuntary muscle contractions or spasms due to abnormally low levels of calcium ions (Ca²⁺) in the extracellular fluid. Low levels of calcium result in increased excitability of neurons, leading to repetitive firing and muscle spasms.

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