This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
Which of the following is not a risk factor for a woman to develop gestational diabetes? 
Select and explain. 
A. Previous macrosomic baby, B. Previous history of gestational diabetes, C. Both parents have diabetes, D. Working mother
D: Working mother
Answer: D: Working mother 
Explanation: GDM risk assessment: should be asceained at the first prenatal visitLow-RiskMember of an ethnic group with a low prevalence of GDMNo known diabetes in first-degree relativesAge <25 yearsWeight normal before pregnancyWeight normal at bihNo history of abnormal glucose metabolismNo history of poor obstetrical outcomeHigh-RiskSevere obesityStrong family history of type 2 diabetesPrevious history of GDM, macrosomic baby, impaired glucose metabolism, or glucosuriaReference: William's obstetrics; 25th edition; Chapter 57; Diabetes