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Although a few case reports link metronidazole with the development of pseudomembranous colitis , albendazole has not been associated with the development of this condition .
 pseudomembranous colitis, metronidazole
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: adverse effect 
Text: {0} 
Answer:
 pseudomembranous colitis, metronidazole