Radiology Consolidation of which portion of the lung is likely to obliterate the Aortic knuckle on X–ray chest – A Left Lingula B Right upper lobe C Apex of lower lobe D Left upper lobe (posterior part) 💡 Explanation Consolidation of which portion of the lung is likely to obliterate the Aortic knuckle on X–ray chest – ✓ Correct Answer: D. Left upper lobe (posterior part)