6619
The most serious potential adverse effect of metformin is lactic acidosis ; this complication is rare , and the vast majority of these cases seem to be related to conditions , such as impaired liver or kidney function , rather than to the metformin itself .
 disease: lactic acidosis
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 disease: lactic acidosis