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: Medicine
In pregnancy cardiac output increases 30 to 40% during? 
Select and explain. 
A. 20th week of pregnancy, B. 22 weeks of pregnancy, C. 24 weeks of pregnancy, D. 28 weeks of gestation
D: 28 weeks of gestation
Answer: D: 28 weeks of gestation 
Explanation: None