3047
We describe two dark - skinned patients who developed hyperpigmented skin and tongue lesions during combination therapy with IFN and ribavirin .
 hyperpigmented skin, IFN; hyperpigmented skin, ribavirin; tongue lesions, IFN; tongue lesions, ribavirin
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:
 hyperpigmented skin, IFN; hyperpigmented skin, ribavirin; tongue lesions, IFN; tongue lesions, ribavirin