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
[{'content': 'All of the following changes may be observed in a normal pregnancy, EXCEPT: \nSelect and explain. \nA. Increase in blood viscosity, B. Fall in serum iron concentration, C. Increase in serum iron binding capacity, D. Increase in blood oxygen carrying capacity', 'role': 'user'}, {'content': 'Answer: A \nExplanation: During pregnancy there is a dispropoionate increase in plasma and RBC volume which produces a state of hemodilution during pregnancy. During pregnancy plasma volume increases upto 50%. RBC volume increases to the extend of 20-30%. The advantages of hemodilution are: Diminished blood viscosity ensures optimum gaseous exchange between the maternal and fetal circulation. Protection of mother against the adverse effects of blood loss during delivery. Ref: Textbook of Obstetrics By D.C. Dutta, 6th edition, Pages 51-55', 'role': 'assistant'}]