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
What is produced by lung tissue to be used in lungs? 
Select and explain. 
A. Angiotensin I, B. Renin, C. Surfactant, D. Angiotensin II
C: Surfactant
Answer: C: Surfactant 
Explanation: Ans. is'c'i.e., SurfactantAmong the given options, two substances are formed in lung-Surfactant: Used by lungs alveoli to reduce surface tension.Angiotensin II : ACE in lungs conve angiotensin I to angiotensin II. But angiotensin II mainly acts on blood vessels, kidney and adrenal coex.