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_39 ( gold INTEGER, nation VARCHAR, silver VARCHAR )

### Question ###
Which Gold has a Nation of sri lanka, and a Silver smaller than 10?

### Accurate SQL ###

SELECT AVG(gold) FROM table_name_39 WHERE nation = "sri lanka" AND silver < 10