Which among following gland produces insulin, chief hormone in body for metabolizing sugar?

Gland

Description

Thymus

Located between the Lungs.

Thymosin is the hormone of the thymus.

Adrenal

The adrenal gland is an endocrine gland that secretes the Adrenalin hormone. 

The pituitary gland is a small pea-sized gland that plays a major role in regulating vital body functions and general wellbeing. 

Hormones produced by the pituitary gland are Adrenocorticotrophic hormone (ACTH), Thyroid-stimulating hormone (TSH), 
Luteinising hormone (LH), etc.

Thyroid

The thyroid gland is an endocrine gland located in the neck.
The thyroid gland secretes three hormones, namely the two thyroid hormones (thyroxine/T4 and triiodothyronine/T3), and calcitonin.

Pineal

It is located in the epithalamus, near the center of the brain.

The shape of the gland resembles a pine cone from which it derived its name.

The smallest gland in the human body.