The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Six hours after birth, a newborn boy is evaluated for tachypnea. He was delivered at 41 weeks' gestation via Caesarian section and the amniotic fluid was meconium-stained. His respiratory rate is 75/min. Physical examination shows increased work of breathing. X-rays of the abdomen and chest show no abnormalities. Echocardiography shows elevated pulmonary artery pressure. He is started on an inhaled medication that increases smooth muscle cGMP, and there is immediate improvement in his tachypnea and oxygenation status. Three hours later, the newborn is tachypneic and there is blue-grey discoloration of the lips, fingers, and toes. Which of the following is the most likely cause of this infant's cyanosis?   (A) Increase in concentration of serum myoglobin   (B) Closure of the ductus arteriosus   (C) Oxidization of Fe2+ to Fe3+   (D) Allosteric alteration of heme groups
['(C) Oxidization of Fe2+ to Fe3+ <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Increase in concentration of serum myoglobin \n (B) Closure of the ductus arteriosus \n (C) Oxidization of Fe2+ to Fe3+ \n (D) Allosteric alteration of heme groups <> possible answers', "  Six hours after birth, a newborn boy is evaluated for tachypnea. He was delivered at 41 weeks' gestation via Caesarian section and the amniotic fluid was meconium-stained. His respiratory rate is 75/min. Physical examination shows increased work of breathing. X-rays of the abdomen and chest show no abnormalities. Echocardiography shows elevated pulmonary artery pressure. He is started on an inhaled medication that increases smooth muscle cGMP, and there is immediate improvement in his tachypnea and oxygenation status. Three hours later, the newborn is tachypneic and there is blue-grey discoloration of the lips, fingers, and toes. Which of the following is the most likely cause of this infant's cyanosis? <> context@"]