26585
In rheumatoid arthritis ( RA ) , several prediction matrices were designed to predict the risk of rapid radiological progression ( RRP ) in the first year of treatment , on either disease modifying anti - rheumatic drug ( DMARD ) monotherapy or combination therapy with prednisone or a biological agent .
 prednisone
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 prednisone