<prompt> Which of the following represents the surface marking of the aoic valve ?Sternal end of left 3rd costal cailageSternal end of right 3rd costal cailageBesides the sternum in left 3rd intercostal spaceBesides the sternum in right 3rd intercostals space  <response>: Surface marking of aoic valve is slightly oblique line,2.5 cm long behind left half of sternum at the level of lower border of left 3rd coastal cailage. BD CHAURASIAS HUMAN ANATOMY.VOLUME1. 6TH EDITION.PAGE NO 291. TABLE NO 21.1 surface marking of cardiac valves 