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
For diagnosing chronic hypertension in pregnancy, hypertension is present prior to what gestational age 
Select and explain. 
A. 8 weeks, B. 14 weeks, C. 20 weeks, D. 24 weeks
C: 20 weeks
Answer: C: 20 weeks 
Explanation: Presence of hypertension prior to 20 weeks is suggestive of chronic hypertension in pregnancy.