This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Heart, Circulation, and Blood, Subject name: Physiology
[{'content': 'A 53-year-old woman with ovarian tumor presents with breathlessness and right-sided chest pain. The chest X-ray shows obliteration of the right costophrenic angle. Diagnosis? \nSelect and explain. \nA. Pleurisy, B. Pericarditis, C. Myocardial infarction, D. Parapneumonic effusion', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A PleurisyRef. CMDT 2019 pg. 323Ovarian tumor (Fibroma and thecoma) can be associated with a right-sided pleural effusion (Meigs syndrome). The obliteration of CP angle on X-ray is another pointer for pleural involvement of this patient.', 'role': 'assistant'}]