Melatonin is secreted by ..........

The pineal gland secretes which hormones?
$I. Serotonin$ $II. ACTH$ $III. MSH$ $IV. PRL$ $V. Melatonin$ $VI. FSH$
The correct option is:

$P$ is a small,round,reddish structure located on the dorsal side of the forebrain. It contains a stalk and releases a hormone $Q$ which controls the diurnal rhythm of the body. $P$ and $Q$ are

The organ which was considered vestigial until recently but is now confirmed to be an endocrine gland is:

The structure surrounding the pineal gland in the forebrain is located at:

Which hormone relates with temperature and sleep-wake cycle?