4019
The abnormal rhythm disappeared with the withdrawal of propranolol and when the drug was restarted a 2 / 1 S - A block was seen .
 Chemical: propranolol; Disease: S - A block
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: propranolol; Disease: S - A block