50 years old is brought to emergency department for evaluation of fever, chills, malaise and fatigue. Cardiac examination reveals a new holosystolic murmur that radiates towards the axilla. Blood cultures are obtained. He undergoes a transoesophageal echocardiography. The USG probe is placed in mid oesophagus facing anteriorly and the cardiac chambers are interrogated. The chamber which is anatomically closer to the probe is
Left atrium Right atrium Left ventricle Right ventricle