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STUDY OBJECTIVE : To determine the effect of metoprolol on dobutamine stress testing with technetium - 99m sestamibi single - photon emission computed tomography imaging and ST - segment monitoring , and to assess the impact of intravenous glucagon on metoprolol ' s effects .
 Chemical: metoprolol; Chemical: dobutamine; Chemical: technetium - 99m sestamibi; Chemical: metoprolol
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:
 Chemical: metoprolol; Chemical: dobutamine; Chemical: technetium - 99m sestamibi; Chemical: metoprolol