<prompt> Which of the following represents the surface marking of the aoic valve:Sternal end of the left 3rd costal cailageSternal end of the right 3rd costal cailageBehind the sternum in left 3rd intercostal spaceBehind the sternum in right 3rd intercostal space  <response>: Aoic valve is represented by an oblique line 2.5 cm running inferolaterally and to the right from the medial end of the left third intercostal space and behind the corresponding region of the sternum. 