2553
We observed ventricular fibrillation in 2 patients who presented to the emergency department with pre - excited atrial fibrillation and were given 12 mg of adenosine .
 adverse effect: ventricular fibrillation, adenosine
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: adverse effect 
Text: {0} 
 Entity Pairs:  ventricular fibrillation, adenosine 
Answer:
 adverse effect: ventricular fibrillation, adenosine