单项选择题

A 30-years-old primipara, 37 gestational weeks, edema legs one week, headache 12 hours, without nausea and vomiting. Examination: BP 160/100mmHg, edema legs+++, urine protein+, hyaline cast 0-2/HP. Which of the following is not the precipitating factor of the disease? 
A、seasonal variation
B、smoking 
C、Chronic hypertension
D、anemia 
E、dumpy figure

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