4122
The effects of a 6 - hour infusion with haloperidol on serum prolactin and luteinizing hormone ( LH ) levels was studied in a group of male subjects .
 Chemical: haloperidol
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: haloperidol