8437
Central and peripheral administration of kisspeptin stimulates the hypothalamic - pituitary - gonadal ( HPG ) axis whilst pre - administration of a gonadotrophin releasing hormone ( GnRH ) antagonist abolishes this effect .
 Chemical: gonadotrophin releasing hormone; Chemical: GnRH
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: gonadotrophin releasing hormone; Chemical: GnRH