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He was found to have atrial flutter at a ventricular rate of 70 / min which slowed down to 30 - 40 / min when nifedipine ( 60 mg ) in 3 divided doses , during which he was paced at a rate of 70 / min .
 Disease: atrial flutter; Chemical: nifedipine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Disease: atrial flutter; Chemical: nifedipine