This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Gynaecology & Obstetrics
Total lung capacity during pregnancy is 
Select and explain. 
A. Unchanged, B. Decreases, C. Increases, D. Increases in the early pregnancy followed by decreasing as the pregnancy progresses
A: Unchanged
Answer: A: Unchanged 
Explanation: Total lung capacity: the combination of FRC and inspiratory capacity is unchanged or decreases by less than 5 percent at term(Ref: William's Obstetrics; 25th edition)