Which of the following is released from hypothalamus?
Orexin
Cortisol releasing hormone
Neuropeptide
Ghrelin
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).