Which of the following statements is incorrect with respect to the melatonin hormone?

Identify the hormone with its correct matching of source and function.

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

The hormone $Melatonin$ is produced by the:

Identify the correct gland on the basis of the following characteristics:
$(I)$ It is located on the dorsal side of the forebrain.
$(II)$ It plays a very important role in the regulation of the $24$-hour rhythm of our body.
$(III)$ It helps in maintaining body temperature.
$(IV)$ Its hormone influences metabolism as well as defense capability.

Suggest a suitable word for the fourth place: Darkening of skin : $MSH$ :: Lightening of skin : .......