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 female presents with 8 weeks amenorrhea with pain left lower abdomen. On USG, there was thick endometrium with mass in lateral adnexa. Most probable diagnosis 
Select and explain. 
A. Ectopic pregnancy, B. Torsion of dermoid cyst, C. Tubo-ovarian mass, D. Hydrosalpinx
A: Ectopic pregnancy
Answer: A: Ectopic pregnancy 
Explanation: Ans. a. Ectopic pregnancy A female with 8 weeks amenorrhea with pain left lower abdomen and on USG, thick endometrium with mass in lateral adnexa is suggestive of ectopic pregnancy