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
Dilatation of upper lobe veins is a reliable sign of: 
Select and explain. 
A. Cardiac decompensation, B. Pulmonary ht., C. Emphysema, D. Silicosis
A: Cardiac decompensation
Answer: A: Cardiac decompensation 
Explanation: Ans. Cardiac decompensation