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: Skin
[{'content': 'Groove sign of greenbalt is seen in ? \nSelect and explain. \nA. LGV, B. Donovanosis, C. Chancroid, D. Genital Herpes', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., LGV Groove sign of Greenblatt' is pathognomonic of LGV when inguinal lymph nodes are enlarged, they are separated by Poupa's ligment, producing a groove.", 'role': 'assistant'}]