SCHEMA:
CREATE TABLE table_28853064_15 (winner VARCHAR, mountains_classification VARCHAR, team_classification VARCHAR)
USER:
Who were the winners if the Mountain Classification award was given to Oscar Solis and Team Classification was given to EPM-Une?

QUERY:
SELECT winner FROM table_28853064_15 WHERE mountains_classification = "Oscar Solis" AND team_classification = "EPM-UNE"