(a) Both \( \mathrm{A} \) and \( \mathrm{R} \) are true and \( \mathrm{R} \) is the correct expl...
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0(a) Both \( \mathrm{A} \) and \( \mathrm{R} \) are true and \( \mathrm{R} \) is the correct explanation for \( \mathrm{A} \).
(b) Both \( \mathrm{A} \) and \( \mathrm{R} \) are true, but \( \mathrm{R} \) is not the correct explanation for \( A \).
(c) \( A \) is true and \( R \) is false.
(d) \( A \) is false and \( R \) is true.
Assertion (A): White matter of brain and spinal cord comprises axons.
Reason (R): Axon of a neuron is coated with myelin sheath.
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