The proteins found in the filaments of muscle fibres are

Actin and myosin

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Myosin and elastin

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Actin only

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Myelin and tubulin

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Solution

The correct option is A Actin and myosin
Skeletal muscle is composed of muscle fibres which have smaller units called myofibrils. There are three types of proteins make up each myofibril; they are contractile, regulatory and structural proteins. By contractile proteins, we mean actin (thin filament) and myosin (thick filament).
So, the correct option is 'actin and myosin'.

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