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: Pathology
[{'content': 'Left Pleural effusion is detected best in which position: March 2005 \nSelect and explain. \nA. Supine, B. Axial, C. Left lateral decubitus, D. Right lateral decubitus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C: Left Lateral decubitusA lateral decubitus view obtained with a horizontal X-ray beam is the most sensitive radiographic projection for detecting an effusion.A small amount of fluid (10-25 mL) can be depicted on this projection.The layering fluid can easily be detected as a dependent, sharply defined, linear opacity separating the lung from the parietal pleural and chest wall.The parietal pleura-chest wall margin can be identified as a line connecting the inner apices of the curvature of the ribs', 'role': 'assistant'}]