28633
After paired PAV , increased active responding was obtained under different schedules of reinforcement , persisted across multiple ACQ sessions , and depended on the number of PAV sessions conducted .
 None
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:  
Answer:
 None