# Quiz

+ 1) Are the following TiDB database system tables in the INFORMATION_SCHEMA library? (Please select 2)
  + A. `TRANSACTION` 
  + B. `TIDB_HOT_REGIONS` 
  + C. `DATA_LOCK_WAITS` 
  + D. `TABLE_PRIV` 
  + E. `COLUMNS_PRIV` 

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B, C