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 causes raised angiotensin in blood -a) Increased blood volumeb) Raised cardiac outputc) Decreased blood pressured) Increased sympathetic tone 
Select and explain. 
A. ab, B. bc, C. cd, D. ac
C: cd
Answer: C: cd 
Explanation: Function of Renin is to convert Angiotensinogen to Angiotensin I. So whenever Renin secretion is increased, Angiotensin I level also increases. Factors which reduce GFR or reduce Na+ delivery to distal tubule causes Renin secretion. Reduced BP or increased sympathetic tone reduces GFR.