1649
Improvement was observed following subsequent arthroscopic washing of the joint space and IV antibiotherapy , and the patient was discharged on day 21 of hospitalization with oral antibiotic and analgesic therapy .
 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