28576
Resumption of menstruation and pituitary response to gonadotropin - releasing hormone in functional hypothalamic amenorrhea undertaking estrogen replacement therapy .
 Chemical: gonadotropin - releasing hormone; Chemical: estrogen
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: gonadotropin - releasing hormone; Chemical: estrogen