This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ovarian Hyperstimulation Syndrome (OHSS), Subject name: Gynaecology & Obstetrics
All are associated with increased risk of Ovarian Hyperstimulation Syndrome, EXCEPT? 
Select and explain. 
A. AMH levels of >3.3 ng/mL, B. Estradiol concentration> 3500 pg/mL, C. Previous history of OHSS, D. Age > 35 yrs
D: Age > 35 yrs
Answer: D: Age > 35 yrs 
Explanation: Risk factors for OHSS *Polycystic ovary syndrome *polycystic ovarian morphology with elevated AMH levels (>3.36ng/mL) *previous episodes of OHSS *high E2(estradiol) concentrations *more than 20 preovulatory follicles