所答非所问suǒ dá fēi suǒ wèn

not answer the question directly; give an answer not relevent to the question
❍ 但他克制着，慢慢地把烟灰磕打出来，和烟荷包一起收拾好了，装在腰里，然后～地说道：……(杨沫《青春之歌》88)Slowly,with a great effort at selfcontrol,he knocked out the ashes and stowed both pipe and pouch back in his pocket,but did not answer the question directly.
❍ 冯大狗，弯了一下腰，～： …… (梁斌《红旗谱》99)Big Dog bowed and said casually: …

所答非所问suo da fei suo fen

not give a direct answer to a question