Which of the following hormone production is influenced by light to a major extent?

In response to visual input (light) from the eyes (retina), the suprachiasmatic nucleus stimulates the pineal gland (via neural connections with sympathetic neurons of the autonomic nervous system) to secrete the hormone melatonin in a rhythmic pattern, with low levels of melatonin secreted during the day and significantly higher levels secreted at night. The changing levels of melatonin, in turn, promote rhythmic changes in sleep, wakefulness, hormone secretion, and body temperature.