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_28853064_15 ( stage VARCHAR, winner VARCHAR, team_classification VARCHAR, mountains_classification VARCHAR )

### Question ###
In what stage did Jaime Vergara won, Team Classification was given to EPM-Une and Mountain Classification winner was Oscar Solis?

### Accurate SQL ###

SELECT stage FROM table_28853064_15 WHERE team_classification = "EPM-UNE" AND mountains_classification = "Oscar Solis" AND winner = "Jaime Vergara"