system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
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?
assistant
The correct answer is  None