The function of pineal body is to
a)	Lighten the skin colours	b)	Control sexual behavior
c)	Regulate the period of puberty	d)	All of the above

(d)

The pineal body (gland) is small mass of tissues near the centre of the mammalian brain. The pineal secretes two biogenic hormone melatonin and serotonin. The pineal contains light sensitive cells and has nervous connections from the eyes. Melatonin regulates function related to light. It also regulates sexual behavior and regulating the period of puberty.