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_12261714_2 (winner VARCHAR, young_rider_classification VARCHAR, stage VARCHAR)

### Question ###
Who's the winner in stage 1a, where the leader in the young rider classification is Francesco Casagrande?

### Accurate SQL ###

SELECT winner FROM table_12261714_2 WHERE young_rider_classification = "Francesco Casagrande" AND stage = "1a"