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
Most frequent site of metastasis in a case of Choriocarcinoma is: 
Select and explain. 
A. Vagina, B. Liver, C. Lungs, D. Brain
C: Lungs
Answer: C: Lungs 
Explanation: Lungs