input: 
  def sql_to_dataframe(sql_query: str, conn: pd.Connection) -> pd.DataFrame:
      """ Converts a given SQL statement into a Pandas DataFrame.
      >>> sql_to_dataframe("SELECT * FROM book;", conn).head()
         id  title  author  year
      0   1  Book1  Author1  2020
      1   2  Book2  Author2  2021
      2   3  Book3  Author3  2022
      3   4  Book4  Author4  2023
      4   5  Book5  Author5  2024
      """
  
output:     return pd.read_sql(sql_query, conn)