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': 'Clotting factor that decreases during pregnancy is? \nSelect and explain. \nA. Fibrinogen, B. Factor XIII, C. Factor VIII, D. Factor X', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Factor XIII REF: Dutta 6th ed p. 52 "Clotting factors that decrease during pregnancy are factor XI and XIII"', 'role': 'assistant'}]