Correct answer choice is :
A) Endocrine system
Step-by-step explanation:
The endocrine system is a biochemical agent operation consisting of hormones, the collection of organs of a body that carry these hormones straight into the circulatory mode to be moved towards different objective glands, and the feedback circuits of homeostasis that the hormones cycle. In humans, the main endocrine organs are the thyroid organ and the adrenal organs. In vertebrates, the hypothalamus is the neural command hub for all endocrine operations. The field of study dispensing with the endocrine practice and its complications is endocrinology, a branch of organic medication.