Question: What is the rnag for  lyric fm 98.7?
Schema: create table table_18475946_2 (rnag__mhz_ varchar, lyric_fm__mhz_ varchar, PRIMARY KEY (rnag__mhz_))
SQL: select rnag__mhz_ from table_18475946_2 where lyric_fm__mhz_ = "98.7"