Which of the following glands secretes oxytocin

Pituitary glands secrete oxytocin.
Pituitary gland (also known as hypophysis) is a small, pea-sized gland located at the base of your brain below your hypothalamus. It sits in its little chamber under your brain known as the sella turcica. It's a part of endocrine system and is in charge of making several essential hormones like oxytoxin.
Oxytocin is a natural hormone that manages key aspects of the female and male reproductive systems, including labour and delivery and lactation, as well as aspects of human behaviour. Hypothalamus makes oxytocin, but your posterior pituitary gland stores and releases it into your bloodstream.