This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Radiology
Earliest radiological sign of pulmonary venous hypeension in chest X-ray is - 
Select and explain. 
A. Cephalization of pulmonary vascularity, B. Pleural effusion, C. Kerley B lines, D. Alveolar pulmonary edema
A: Cephalization of pulmonary vascularity
Answer: A: Cephalization of pulmonary vascularity 
Explanation: Upper lobe venous diversion is the 1st radiological sign of PVH. Kerley B lines , perihilar haze ,peribronchial cuffing,pulmonary ossicles,fine punctate calcification and perihilar wing pattern.