12991
A 62-year - old Caucasian man with atrial fibrillation who was taking warfarin reported an episode of hematochezia ; his international normalized ratio ( INR ) was 1.74 .
 hematochezia, warfarin
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:
 hematochezia, warfarin