Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
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?
### Answer:
SELECT stage FROM table_28853064_15 WHERE team_classification = "EPM-UNE" AND mountains_classification = "Oscar Solis" AND winner = "Jaime Vergara"