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
Patient is being treated with clomiphene for infeility method of choice to look for ovulation : 
Select and explain. 
A. Serial ultrasound, B. Chest X-ray, C. Serial HCG, D. None
A: Serial ultrasound
Answer: A: Serial ultrasound 
Explanation: Serial ultrasound