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
Anita 15-year-old, complains of heavy periods since 2 months. O/E: wt 40 kg and BP 120/80 mmHg. All of the following investigations are indicated, except: 
Select and explain. 
A. STSH, B. Platelet count, C. Bleeding and clotting time, D. Estradiol levels
D: Estradiol levels
Answer: D: Estradiol levels 
Explanation: None