2540
Other antibacterial agents that showed associations included erythromycins ( 2 defects ) , penicillins ( 1 defect ) , cephalosporins ( 1 defect ) , and quinolones ( 1 defect ) .
 erythromycins, penicillins, cephalosporins, quinolones
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 erythromycins, penicillins, cephalosporins, quinolones