Retrieve single record with condition using query expression

Hi All,

Quick question 

I want to retrieve a record with a where condition , I know this query will return me a single record.

I know how to do it using Query Expression and the service.RetrieveMultiple .

Is there any way I can add a filter condition with service.Retrieve too?

If no , then is using service.RetrieveMultiple the most accurate way for writing such a query.

Thanks