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: Gynaecology & Obstetrics
Maximum increase in cardiac output occurs by what stage of pregnancy : 
Select and explain. 
A. 10th week, B. 20th week, C. 30th week, D. At the onset of labour
C: 30th week
Answer: C: 30th week 
Explanation: 30th week