grammatical number - When uncertain if refering to multiple or single should the plural form or singular form be used?

If asking a question or giving instruction towards a group of objects where the number is unknown (and possibly could be one) what is the correct way to phrase the sentence? Which of the following sentences are more correct:

Has there been any studies regarding this and if so what has been the
conclusion?

OR

Has there been any studies regarding this and if so what have been the

conclusions?