stupid mistake

in my nov2010 pcc acc paper Q1 was compulsary and their was choice to leave 1 q from the remaining Qs. unfortunately due to stress of  first paper i didnot read this and attempted all Qs. i have just seen the solution and my partnership Q which is Q no.2 is wrong. how will my paper be marked? will the examiner excuse Qno.2 as it is wrong and i had choice to leave it or will they deduct marks for Qno.2 and cancel some other Q.