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: Unknown
In pregnancy, there is a physiological increase of the- 
Select and explain. 
A. Blood pressure in the third trimester, B. Blood viscosity, C. Cardiac output, D. Peripheral resistance of the blood vessels
C: Cardiac output
Answer: C: Cardiac output 
Explanation: Ans: C