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: Physiology
True statement regarding difference between apex and base of lung, in erect posture is:March 2012, March 2013 
Select and explain. 
A. V/ Q is low at the apex of lung, B. V/ Q is high at the apex of lung, C. V/ Q remain same at both apex and base, D. None of the above
B: V/ Q is high at the apex of lung
Answer: B: V/ Q is high at the apex of lung 
Explanation: Ans: B i.e. V/ Q is high at the apex of lungV/ Q changes from region to region of the lung.Thus in apical zone in the erect posture, Q (perfusion) is very low and therefore V/ Q ratio is high. While at the bases, it (V/ Q) is low