<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 65-year-old man presents to the emergency department for a loss of vision. He was outside gardening when he suddenly lost vision in his right eye. He then immediately called emergency medical services, but by the time they arrived, the episode had resolved. Currently, he states that he feels fine. The patient has a past medical history of diabetes and hypertension. His current medications include lisinopril, atorvastatin, metformin, and insulin. His temperature is 99.5F 37.5C, blood pressure is 14095 mmHg, pulse is 90min, respirations are 12min, and oxygen saturation is 98 on room air. Cardiac exam is notable for a systolic murmur along the right sternal border that radiates to the carotids. Pulmonary exam reveals mild bibasilar crackles. Neurological exam reveals cranial nerves II-XII as grossly intact with 55 strength and normal sensation in the upper and lower extremities. The patient has a negative Rombergs maneuver, and his gait is stable. A CT scan of the head demonstrates mild cerebral atrophy but no other findings. Which of the following is the next best step in management?? A: Tissue plasminogen activator, B: MRI, C: Heparin bridge to warfarin, D: Ultrasound of the neck, E: No further management necessary,  <response>: This is a clinical vignette about a 65-year-old man with a history of diabetes and hypertension who presented with sudden vision loss in his right eye that resolved. The key findings are the transient monocular vision loss, history of diabetes and hypertension, cardiac murmur, and mild bibasilar crackles on lung exam. The differential diagnosis includes:- Transient ischemic attack TIA involving the retinal artery - Most likely given the sudden transient monocular vision loss. TIAs can be a warning sign for future stroke.- Diabetic retinopathy - Less likely as vision loss was sudden and transient. Diabetic retinopathy typically causes more chronicprogressive vision changes.- Embolic event from cardiac source thrombusvegetation - Possible given the cardiac murmur. Emboli from the heart can occlude retinal arteries. - Giant cell arteritis - Less likely given lack of other symptoms jaw claudication, scalp tenderness, constitutional symptoms. Usually causes more prolonged vision loss.Imaging of the head was unremarkable. The next step should be focused on identifying the underlying cause and preventing further events. Vascular imaging of the headneck and cardiac workup are warranted.D: Ultrasound of the neck 