3490
The serum K during the control period was 4 . 5 + / - 0 . 2 mEq / l an on 50 , 100 , 150 and 200 mg HCTZ daily 3 . 9 + / - 0 . 3 , 3 . 4 + / - 0 . 2 , 2 . 9 + / - 0 . 2 , and 2 . 4 + / - 0 . 3 mEq / l , respectively .
 Chemical: K; Chemical: HCTZ
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: K; Chemical: HCTZ