cannot apply indexing with [] to an expression of type

[xnaLearner]

var dbPerson = from p in db.People
where p.Id == PersonId select p;
dbPerson[0].HolidaysRemaining--;

is throwing me an error with dbPerson[0] saying cannot apply indexing with [] to an expression of type 'system.linq.lqueryable,holidayBookingApp.model.person> can someone please advise how I can resolve this? Thanks