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
Which of the following is the best known metabolic function of the lung 
Select and explain. 
A. Inactivation of serotonin, B. Conversion of angiotensin I to angiotensin II, C. Inactivation of bradykinin, D. Metabolism of basic drugs by cytochrome P450 system
B: Conversion of angiotensin I to angiotensin II
Answer: B: Conversion of angiotensin I to angiotensin II 
Explanation: None