4402
In patients with chronic heart failure , spironolactone added to conventional treatment may lead to serious and , occasionally , fatal hyperkalaemia .
 serious and , occasionally , fatal hyperkalaemia, spironolactone
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:
 serious and , occasionally , fatal hyperkalaemia, spironolactone