C is correct answer, as the isolation of insulin is the Real story which is not revealed.
It is a modifier and meaning error question.
In option D. It looks like insulin is the major breakthrough of twenties century, which is incorrect.
Major breakthrough is isolation of insulin. Insulin is known as hormone from years in medical field.
It is a modifier and meaning error question.
In option D. It looks like insulin is the major breakthrough of twenties century, which is incorrect.
Major breakthrough is isolation of insulin. Insulin is known as hormone from years in medical field.
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