The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 72-year-old woman is admitted to the hospital for treatment of unstable angina. Cardiac catheterization shows occlusion that has caused a 50% reduction in the diameter of the left circumflex artery. Resistance to blood flow in this vessel has increased by what factor relative to a vessel with no occlusion?   (A) 64   (B) 16   (C) 8   (D) 4
['(B) 16 <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) 64 \n (B) 16 \n (C) 8 \n (D) 4 <> possible answers', '  A 72-year-old woman is admitted to the hospital for treatment of unstable angina. Cardiac catheterization shows occlusion that has caused a 50% reduction in the diameter of the left circumflex artery. Resistance to blood flow in this vessel has increased by what factor relative to a vessel with no occlusion? <> context@']