Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_50 (sio_2 INTEGER, na_2_o VARCHAR, k_2_o VARCHAR, fe_2_o_3 VARCHAR)

### Question ###
What is the highest SiO 2, when K 2 O is greater than 0.16, when Fe 2 O 3 is greater than 0.16, and when Na 2 O is less than 7.53?

### Accurate SQL ###

SELECT MAX(sio_2) FROM table_name_50 WHERE k_2_o > 0.16 AND fe_2_o_3 > 0.16 AND na_2_o < 7.53