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
A 26 years old female presented with mild pain in lower abdomen. She has had 2 full-term normal delivery earlier. Her last menstrual period was 3 weeks back. On pelvic examination, you find a palpable mass in the adnexa. On USG pelvis, you find a 5 cm ovarian cyst. What should be your next step? 
Select and explain. 
A. Observation and follow-up for cyst after 2-3 months, B. CA-125 levels, C. Diagnostic exploratory laparotomy, D. CECT of pelvis
A: Observation and follow-up for cyst after 2-3 months
Answer: A: Observation and follow-up for cyst after 2-3 months 
Explanation: Ans: A. Observation and follow-up for cyst after 2-3 months(Ref: Shaw's 15/e p369)The patient is premenopausal, 3 weeks after LMP (likely to have ovulated) with a 5 cm cyst.The scenario presented here likely represents the patient having a corpus luteum cyst.These cysts need not be approached aggressively unless causing significant symptoms.