This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
[{'content': 'In . sided hemithorax on chest X-ray PA view what can be excluded: \nSelect and explain. \nA. CCF, B. TB, C. Pulmonary infarct, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. CCF Congestive cardiac failure is a condition which presents with B/L changes in chest X RayQ - so it can be excluded by seeing U/L hemithorax on chest X Ray, if it is normal.;', 'role': 'assistant'}]