Answer the following question given this paragraph: 

Diseases of the endocrine system are relatively common. An endocrine disease usually involves the secretion of too much or not enough hormone. When too much hormone is secreted, it is called hypersecretion . When not enough hormone is secreted, it is called hyposecretion .


Q: An endocrine disease usually involves the secretion of too much or not enough of what?

 Choices:

- neurotransmitter

- protein

- metabolism

- hormone

A:
hormone
