77-year-old man seeks medical attention because of shortness of breath on minimal exertion. His chest X-ray reveals a right-sided pleural effusion. The aspirated fluid is straw colored and clear. The protein concentration is low, and the specific gravity is 1.011(low). Which of the following is the most likely cause of the effusion. A- Tuberculosis B- Left ventricular heart failure C- lung cancer D- Pneumonia

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