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
[{'content': 'In pregnancy, there is a physiological increase of the- \nSelect and explain. \nA. Blood pressure in the third trimester, B. Blood viscosity, C. Cardiac output, D. Peripheral resistance of the blood vessels', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans: C', 'role': 'assistant'}]