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
All of the following statements about bronchial circulation are true, except : 
Select and explain. 
A. Contribute 2% of systemic circulation, B. Contribute to gaseous exchange, C. Cause venous admixing of blood, D. Provide nutritive function to lung
B: Contribute to gaseous exchange
Answer: B: Contribute to gaseous exchange 
Explanation: Bronchial circulation does not contribute to gas exchange. Ref: The Mechanics of the Circulation By C. G. Caro, T. J. Pedley, R. C. Schroter, W. A. Seed, K. H. Parker, Page 475; Equine Respiratory Medicine and Surgery By Bruce C. McGorum, Padraic M. Dixon, N. Edward Robinson, Page 34; Medical Physiology : Principles for Clinical Medicine By Rodney Rhoades, David R. Bell, Page 371.