This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Obs), Subject name: Gynaecology & Obstetrics
[{'content': 'Obesity in pregnancy causes all of the following complication except: \nSelect and explain. \nA. Abnormal uterine action, B. Fetal neural tube defect, C. Precipitate labor, D. Venous thrombosis', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is c, i.e. Precipitate labourRef. Dutta Obs. 7/e, p 344; Williams Obs. 23/e, p 951, 952Obesity in PregnancyBody weight >90 kg or BMI >30kg/m2 is considered obese.(BMI = 20-24 is normal) >25kg/m2 OverweightObesity is associated with increased incidence of:During pregnancy:Dyspnoea on exertionHypertension (essential and PIH)DiabetesAnomalies is increasedDifficulty in diagnosis of presentation and in hearing the FHS.During labour:Abnormal uterine contractionsProlonged labour (and not precipitate labour)Shoulder dystociaOperative interference/anesthetic complications.In puerperium:Venous thrombosisLactation failure.Note: Obese pregnant females should be considered under 'High Risk group'Risk to the fetus in case of maternal obesity:| incidence of first trimester abortions| Incidence of fetal anomalies - especially neural tubal defectsMacrosomia which in turn leads to |chances of shoulder dystocia, birth injury and |incidence of low apgarScores and perinatal death (Ref High risk pregnancy Manju puri SS. Trivedi, p 493)|Still birth rateIn adult life - such fetuses have increased chances of obesity and heart diseases.", 'role': 'assistant'}]