11402
Locally administered prostaglandin E2 prevents aeroallergen - induced airway sensitization in mice through immunomodulatory mechanisms .
 Chemical: prostaglandin E2
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: prostaglandin E2 
Answer:
 Chemical: prostaglandin E2