The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 59-year-old man is brought to the emergency department with a history of black, tarry stools but denies vomiting of blood or abdominal pain. His family has noticed progressive confusion. History is significant for liver cirrhosis and alcoholism. His heart rate is 112/min, temperature is 37.1°C (98.7°F), and blood pressure is 110/70 mm Hg. On examination, he is jaundiced, lethargic, is oriented to person and place but not date, and has moderate ascites. Neurological examination reveals asterixis, and his stool is guaiac-positive. Liver function test are shown below: Total albumin 2 g/dL Prothrombin time 9 seconds Total bilirubin 5 mg/dL Alanine aminotransferase (ALT) 100 U/L Aspartate aminotransferase (AST) 220 U/L Which of the following is a feature of this patient condition?   (A) Ammonia level is the best initial test to confirm the diagnosis   (B) It is a diagnosis of exclusion   (C) It only occurs in patients with cirrhosis   (D) Electroencephalography (EEG) usually shows focal localising abnormality
['(B) It is a diagnosis of exclusion <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Ammonia level is the best initial test to confirm the diagnosis \n (B) It is a diagnosis of exclusion \n (C) It only occurs in patients with cirrhosis \n (D) Electroencephalography (EEG) usually shows focal localising abnormality <> possible answers', '  A 59-year-old man is brought to the emergency department with a history of black, tarry stools but denies vomiting of blood or abdominal pain. His family has noticed progressive confusion. History is significant for liver cirrhosis and alcoholism. His heart rate is 112/min, temperature is 37.1°C (98.7°F), and blood pressure is 110/70 mm Hg. On examination, he is jaundiced, lethargic, is oriented to person and place but not date, and has moderate ascites. Neurological examination reveals asterixis, and his stool is guaiac-positive. Liver function test are shown below:\nTotal albumin 2 g/dL\nProthrombin time 9 seconds\nTotal bilirubin 5 mg/dL\nAlanine aminotransferase (ALT) 100 U/L\nAspartate aminotransferase (AST) 220 U/L\nWhich of the following is a feature of this patient condition? <> context@']