This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Imaging of Pleural Disease, Subject name: Radiology
[{'content': 'A boy presented in the OPD with minimal pleural effusion on the right side. The best method to detect this would be : \nSelect and explain. \nA. Left side chest X-ray, B. Right side chest X-ray, C. Right lateral decubitus chest X-ray, D. Left lateral decubitus chest X-ray', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' is Right lateral decubitus chest X-ray Most dependent recess of the pleura is the posterior costophrenic angle*.So in pleural effusion this recess would be filled earliest. But at least 100-200 ml of fluid would be required to fill this recess before it can be detected on a PA view.Therefore in cases of minimal pleural effusion the best method to detect it would be- Decubitus view with a horizontal beam.", 'role': 'assistant'}]