<prompt> Serum Creatine PhosphoKinase-3 CPK-3 is elevated in-Muscular dystrophyMyocardial infarctionAlcoholic cirrhosisBrain tumours  <response>: Musculardystrophy CreatineKinaseCKor CreatinePhosphokinaseCPKcatalysestheinterconversionof phosphocreatineto creatine. CPKexistsasthreeisoenzymes.Eachisoenzymeisa dimercomposedoftwosubunits- MmuscleorB Brainorboth Isoenzyme SubUnit Tissueoforigin CPK1 BB Brain CPK2 MB Hea CPK3 MM SkeletalMuscle 