This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Obstetrics, Subject name: Gynaecology & Obstetrics
TRUE about Gestational Trophoblastic Disease is? 
Select and explain. 
A. Most common site of metastasis is vagina, B. Presence of Lung metastasis classifies as stage 4 GTN, C. Liver metastasis carries a poor prognosis similar to brain metastasis, D. GTN following a term pregnancy has a better prognosis than that with previous molar pregnancy
C: Liver metastasis carries a poor prognosis similar to brain metastasis
Answer: C: Liver metastasis carries a poor prognosis similar to brain metastasis 
Explanation: Most common site of metastasis in choriocarcinoma is lung, which is classified as stage 3. Brain and liver metastasis are stage 4 and carry poor prognosis GTN following term pregnancy carries worse prognosis than that following a molar pregnancy or an aboion