Question: Who was second runner up when Janina San Miguel won Binibining Pilipinas-World?
Schema: create table table_1825751_4 (second_runner_up varchar, binibining_pilipinas_world varchar, PRIMARY KEY (second_runner_up))
SQL: select second_runner_up from table_1825751_4 where binibining_pilipinas_world = "janina san miguel"