3290
The H2 - histamine receptor antagonists ranitidine and cimetidine were compared for their abilities to control gastric acid hypersecretion on a short - and long - term basis in 22 patients with gastric acid hypersecretory states .
 Chemical: histamine; Chemical: ranitidine; Chemical: cimetidine
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: histamine; Chemical: ranitidine; Chemical: cimetidine