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A study following large patient groups on theophylline and a combination of theophylline and steroids might clarify the risk of ulcer formation in patients being treated with these medications for asthma .
 adverse effect: ulcer, theophylline; adverse effect: ulcer, theophylline
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:  ulcer, theophylline; ulcer, theophylline 
Answer:
 adverse effect: ulcer, theophylline; adverse effect: ulcer, theophylline