S2 is best appreciated in:

Answer is A (3rd left intercostal space) Best areas to auscultate for both components of the second hea sound (A2 and P2) are either the left sternal border at the level of second intercostal space (Pulmonic area) or the left sternal border at the level of third intercostal space (Erb's point). The second hea sound has two components A2 (from Aoic closure) and P2 (from pulmonary closure). P2 is a soft sound that is poorly transmitted. It is best heard at the pulmonic area and is transmitted only as far as the Erb's point. A2 is a loud sound best heard over the aoic area but since it is widely transmitted it may be heard across all areas of the chest even as far as the apex. Second hea sound (S2) is best heard over the pulmonic area (Since both A2 and P2 can be heard at the pulmonic area). Note that even at the pulmonic area A2 is louder than P2. The other area to auscultate for both components of the second hea sound is at the left sternal border of the third intercostal space (Erb 's point)