<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 19-year-old man is brought to the emergency department 35 minutes after being involved in a high-speed motor vehicle collision. On arrival, he is alert, has mild chest pain, and minimal shortness of breath. He has one episode of vomiting in the hospital. His temperature is 37.3C 99.1F, pulse is 108min, respirations are 23min, and blood pressure is 9070 mm Hg. Pulse oximetry on room air shows an oxygen saturation of 92. Examination shows multiple abrasions over his trunk and right upper extremity. There are coarse breath sounds over the right lung base. Cardiac examination shows no murmurs, rubs, or gallop. Infusion of 0.9 saline is begun. He subsequently develops increasing shortness of breath. Arterial blood gas analysis on 60 oxygen shows:pH 7.36pCO2 39 mm HgpO2 68 mm HgHCO3- 18 mEqLO2 saturation 81An x-ray of the chest shows patchy, irregular infiltrates over the right lung fields. Which of the following is the most likely diagnosis?? A: Pneumothorax, B: Pulmonary contusion, C: Pulmonary embolism, D: Aspiration pneumonia, E: Acute respiratory distress syndrome,  <response>: This is a clinical vignette describing a 19-year-old man who was involved in a high-speed motor vehicle collision 35 minutes ago. He has mild chest pain, shortness of breath, vomiting, tachycardia, hypotension, and hypoxemia. Physical exam shows abrasions and coarse breath sounds over the right lung. Arterial blood gas shows respiratory alkalosis and hypoxemia. Chest X-ray shows patchy infiltrates in the right lung fields. Based on the history of high-speed MVC, physical exam findings of unilateral lung findings, and chest X-ray results, this patient likely has pulmonary contusion resulting from trauma to the right lung. Pneumothorax, pulmonary embolism, and aspiration pneumonia are less likely given the acute traumatic mechanism. Acute respiratory distress syndrome is possible but less likely than pulmonary contusion as the initial diagnosis.B: Pulmonary contusion 