Which of the following secretes insulin hormone in human body to regulate blood sugar level ?

Pancreas.

The correct answer is Option (3) – Pancreas.

Insulin  is a hormone which is produced by the pancreas and helps in regulating blood sugar levels. If it is not secreted in proper amounts, the sugar level in the blood rises causing many harmful effects.

An organ in the back of your abdomen (belly)is called the pancreas . It is a component of both your endocrine and digestive systems.