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# 200ml of an aqueous solution of a protein contains its 1.26 g. The Osmotic Pressure of this solution at 300 K is found to be $2.57 × 10^{−3}$ bar. The molar mass of protein will be ($R = 0.083 L bar mol^{−1} K^{−1}$)

$61038 g mol^{−1}$
Hence (B) is the correct answer.