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Question 16A 55-year-old woman with ovarian cancer develops sudden onset dyspnea and chest pain. What is the most appropriate initial investigation?A. Chest X-rayB. D-dimer testC. EchocardiogramD. CT pulmonary angiogramE. Ventilation-perfusion scanAnswer: D-dimer testExplanation: The presentation suggests pulmonary embolism, which is common in cancer patients. A D-dimer test is the most appropriate initial investigation due to its high sensitivity.
