The correct answer would be option D, Insulin.
Insulin is secreted by the pancreas.
Explanation:
Insulin is a hormone. This hormone is secreted by the pancreas in the body of the human beings.
When humans eat carbohydrates, or takes sugary products, this increases the sugar levels in the blood. In order to maintain the desired sugar level in the blood of human beings, the pancreas secrete a hormone, called insulin, which puts down the sugar levels to normal levels.
Insulin is secreted in response of the blood glucose levels. Higher the sugar levels, higher insulin is secreted, lower the sugar levels, lower insulin is secreted.
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