my app was remove from play store due to following reason

I think that,
This problem is create due to I was target my app to all countries.

and I select
Target audience and content 18+

Then also I am facing trouble to publish my app

As the mail response says, you have provided incorrect rating questionnaire.

You need to provide correct rating questionnaire information that correctly reflects your app content, so that your app will get appropriate content rating.

Retake the rating questionnaire and resubmit your app.