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It is suggested that the fatal stroke may have resulted from arterial spasm caused by ergotamine overdosage and possibly complicated by thrombosis .
 arterial spasm, ergotamine; fatal stroke, ergotamine
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:
 arterial spasm, ergotamine; fatal stroke, ergotamine