18622
The objective of this study was to investigate protective effects of calcium channel blockers ( CCBs ) verapamil and nimodipine on nephrotoxicity induced by Pb acetate in mice .
 Chemical: calcium; Chemical: verapamil; Chemical: nimodipine; Chemical: Pb acetate
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: calcium; Chemical: verapamil; Chemical: nimodipine; Chemical: Pb acetate