If you are pulled over and an officer suspects that you are under the influence of alcohol or drugs you are likely to be asked a series of questions. The manner in which you respond to those questions may determine what steps the officer takes.
Typically the first thing you will be asked is if you know why the officer pulled you over. The officer asks the question in part to see if you will admit to certain behavior. Be polite and ask the officer why that question is being asked. Then wait for the officer to identify what led to the motor vehicle stop.
The officer will likely ask if you have had anything to drink or consumed any drugs. If you have not consumed alcohol or drugs tell that to the officer. If you have consumed any such substance you do not have to share that information. Tell the officer that you are not going to answer that question. You have the right not to answer questions posed by an officer other than questions related to your identification.
You have the right to remain silent. That silence is generally the best answer to give to almost every question an officer asks when that officer is conducting an investigation.