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
Obliteration of left hea border in PA chest X-ray is suggestive of: 
Select and explain. 
A. Lingular pathology, B. Left upper lobe lesion, C. Left hilar lymph nodes, D. Left lower lobe lesion
A: Lingular pathology
Answer: A: Lingular pathology 
Explanation: Ans. Lingular pathology