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In animals with normal renal function , OCT induced a transient decrease in serum PTH levels at a dose of 0 . 1 microg / kg , which was not sustained with lowering of the doses .
 Chemical: OCT
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: OCT