This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Medical, surgical and gynaecological illness complicating pregnancy, Subject name: Gynaecology & Obstetrics
Which of the following hematological criteria remains unchanged during pregnancy 
Select and explain. 
A. Blood Volume, B. TIBC, C. MCHC, D. S. ferritin
C: MCHC
Answer: C: MCHC 
Explanation: MCV increases minimally during pregnancy MCHC remains unchanged Reference: High risk pregnancy Fernando Arias 4th edition Page no: 234