A 48-year-old man with mitral regurgitation (MR) comes to the physician for a routine examination. The best position to auscultate for MR is usually at the apex. 

Which of the following options most accurately corresponds to the location to auscultate?: (A) Left 2nd intercostal space, (B) Left 4th intercostal space, (C) Left 5th intercostal space, (D) Right 2nd intercostal space
Answer is C. None