The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 55- year old diabetic patient presents with transient obscuration in vision for 2-3 days followed by sudden loss of vision. Which of the following would be the best test to evaluate the symptoms?   (A) Serum ACE levels   (B) Quantiferon-Gold TB test   (C) Elevated homocysteine levels   (D) Serum creatinine levels
['(D) Serum creatinine levels <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Serum ACE levels \n (B) Quantiferon-Gold TB test \n (C) Elevated homocysteine levels \n (D) Serum creatinine levels <> possible answers', '  A 55- year old diabetic patient presents with transient obscuration in vision for 2-3 days followed by sudden loss of vision. Which of the following would be the best test to evaluate the symptoms? <> context@']