input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Which of the following tests is most sensitive for the detection of iron depletion in pregnancy ?   (A) Serum iron   (B) Serum ferritin   (C) Serum transferrin   (D) Serum iron binding capacity
output: ['(B) Serum ferritin <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Serum iron  (B) Serum ferritin  (C) Serum transferrin  (D) Serum iron binding capacity <> possible answers', '  Which of the following tests is most sensitive for the detection of iron depletion in pregnancy ? <> context']