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
Physiological changes of pregnancy include :
a. Insulin levels increase
b. Increased BMR
c. Hypothyroidism
d. GH decreases
e. Blood volume decreases 
Select and explain. 
A. ab, B. ac, C. bc, D. db
A: ab
Answer: A: ab 
Explanation: Hormones during pregnancy