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
All are chest x-ray signs of pulmonary embolism except 
Select and explain. 
A. Westermark's sign, B. Felson's sign, C. Palla's sign, D. Monod sign
D: Monod sign
Answer: D: Monod sign 
Explanation: Monod sign - Aspergilloma.