The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 25-year-old woman comes to the physician for the evaluation of nausea for the last two weeks. During this period, she has had increased urinary frequency and fatigue. She also reports two episodes of non-bloody vomiting. There is no personal history of serious illness. Her last menstrual period was 6 weeks ago. Physical examination shows bilateral breast tenderness. The remainder of the examination shows no abnormalities. A urine pregnancy test is positive. Which of the following is the most accurate predictor of the gestational age?   (A) Ratio of head to abdominal circumference   (B) Femoral length   (C) Crown-rump length   (D) Biparietal length
['(C) Crown-rump length <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Ratio of head to abdominal circumference \n (B) Femoral length \n (C) Crown-rump length \n (D) Biparietal length <> possible answers', '  A 25-year-old woman comes to the physician for the evaluation of nausea for the last two weeks. During this period, she has had increased urinary frequency and fatigue. She also reports two episodes of non-bloody vomiting. There is no personal history of serious illness. Her last menstrual period was 6 weeks ago. Physical examination shows bilateral breast tenderness. The remainder of the examination shows no abnormalities. A urine pregnancy test is positive. Which of the following is the most accurate predictor of the gestational age? <> context@']