This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Surfaces and Grooves, Subject name: Anatomy
Which of the following represents the surface marking of aoic valve? 
Select and explain. 
A. Sternal end of left 3rd costal cailage, B. Sternal end of right 3rd costal cailage, C. Beside sternum in right 2nd intercostals space, D. Besides the sternum in the right 3 rdintercostals space
A: Sternal end of left 3rd costal cailage
Answer: A: Sternal end of left 3rd costal cailage 
Explanation: Valve Diameter of orifiice Surface marking Ausculatory area Pulmonary valve 2.5 cm Upper border of the sterna end of left 3rd costal cailage Left 2nd intercostals space near the sternum Aoic valve 2.5 cm Lower border of the sternal end of left 3rd costal cailage RIght 2nd intercostals space near the sternum Mitral valve 3 cm Left half of the sternum near the left 4th costal cailage Cardiac apex Tricuspid valve 4 cm Right half of the sternum opposite the 4th & 5th intercostals space Lower end of sternum on the left side