This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Normal Labour, Subject name: Gynaecology & Obstetrics
[{'content': 'All are risk factors for preterm delivery except: \nSelect and explain. \nA. Absence of fetal fibronectin at <37 weeks, B. Previous history of preterm baby, C. Asymptomatic cervical dilatation, D. Chlamydial infection of genital tract', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is a, i.e. Absence of fetal fibronection at <37 weeksRef. Fernando Arias 4/eRisk factors for preterm labor: have been discussed in Ans. 1Fetal fibronectinIt is a fetal glycoprotein found in the cervicovaginal discharge before 22 weeks and again after rupture of membranes.Levels of fibronectin >50mg/ml indicates preterm delivery (not absence of fibronectin).', 'role': 'assistant'}]