<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A pulmonary autopsy specimen from a 58-year-old woman who died of acute hypoxic respiratory failure was examined. She had recently undergone surgery for a fractured femur 3 months ago. Initial hospital course was uncomplicated, and she was discharged to a rehab facility in good health. Shortly after discharge home from rehab, she developed sudden shortness of breath and had cardiac arrest. Resuscitation was unsuccessful. On histological examination of lung tissue, fibrous connective tissue around the lumen of the pulmonary artery is observed. Which of the following is the most likely pathogenesis for the present findings?? A: Thromboembolism, B: Pulmonary ischemia, C: Pulmonary hypertension, D: Pulmonary passive congestion, E: Pulmonary hemorrhage,  <response>: This is a medical question asking about the most likely pathogenesis for fibrous connective tissue around the lumen of the pulmonary artery based on the clinical history provided. The key details in the history are that the patient recently underwent femur surgery, developed sudden shortness of breath after discharge, and then had cardiac arrest. This suggests a possible thromboembolic event from deep vein thrombosis after the surgery leading to pulmonary embolism and acute hypoxic respiratory failure. The choices describe different pulmonary pathologies, so I need to select the one most consistent with pulmonary embolism.A: Thromboembolism 