This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax, Subject name: Anatomy
Surface marking of the mitral valve is 
Select and explain. 
A. Behind sternal end of left 4th costal cailage, B. Behind sternal end of right 4th costal cailage, C. Left 4th intercostal space in the midclavicular line, D. Left 3rd intercostal space in the midclavicular line
A: Behind sternal end of left 4th costal cailage
Answer: A: Behind sternal end of left 4th costal cailage 
Explanation: Surface marking of mitral value is an oblique line 3 cm behind the left half of sternum opposite left 4th coastal cailage. <img src=" /> BD CHAURASIA'S HUMAN ANATOMY.VOLUME 1.6TH EDITION.PAGE NO 291.TABLE 21.1:SURAFACE MARKING OF CARDIAC VALVE