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
Clotting factor that decreases during pregnancy is? 
Select and explain. 
A. Fibrinogen, B. Factor XIII, C. Factor VIII, D. Factor X
A: Fibrinogen
Answer: A: Fibrinogen 
Explanation: Factor XIII REF: Dutta 6th ed p. 52 "Clotting factors that decrease during pregnancy are factor XI and XIII"