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: Unknown
Increased pulmonary blood flow radiologically indicated by all except: 
Select and explain. 
A. Descending pulmonary artery diameter > 16 mm, B. Kerley B lines, C. Diameter of 2 peripheral arteries > accompanying bronchus, D. Peripheral arteries more than 6 in outer 1/3rd
B: Kerley B lines
Answer: B: Kerley B lines 
Explanation: (Refer – M.Satpathy’s Clinical Diagnosis of Congenital Heart Disease, 1st edition, pg no: 38)
Features of increased pulmonary blood flow

Blood vessels become visible in the outer third of lung field (At least 6 vessels can be traced to theouter third). When hilar and intrapulmonary vessels are uniformly changed, it is very suggestive of shunt lesions.
Ratio of right descending pulmonary artery to trachea > 1
Right descending pulmonary artery diameter> 14 mm suggests increased blood flow and >17 mm is very strongly suggestive
Prominent end-on vessels seen at hilum
Enface vessels below 10th posterior rib
Prominent vessels seen below crest of diaphragm
Ratio of vessels to adjacent bronchus >2:1