3289
Comparison of the effectiveness of ranitidine and cimetidine in inhibiting acid secretion in patients with gastric hypersecretory states .
 Chemical: ranitidine; Chemical: cimetidine
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
 Entities: ranitidine, cimetidine 
Answer:
 Chemical: ranitidine; Chemical: cimetidine