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_35 (sample_size INTEGER, date_s__administered VARCHAR)

### Question ###
What is the highest sample size administered on October 18?

### Accurate SQL ###

SELECT MAX(sample_size) FROM table_name_35 WHERE date_s__administered = "october 18"