Which of the following is released from hypothalamus?
There are 6 established hypothalamic releasing and inhibiting hormones : 

Corticotropin-releasing hormone (CRH),
Thyrotropin releasing hormone (TRH),
Growth hormone releasing hormone (GRH),
Growth  hormone inhibiting hormone (GIH),
Luteinizing hormone releasing hormone (LHRH) and
Prolactin inhibiting hormone(PIH).
Orexin
Cortisol releasing hormone
Neuropeptide
Ghrelin