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: Unknown
[{'content': "Romana's sign is seen in? \nSelect and explain. \nA. Toxoplasma, B. Trypanosoma cruzi, C. Loa loa, D. Wuchereria", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Trypanosoma cruzi Romana sign, also known as chagoma, refers to periorbital swelling, palpebral oedema and conjunctivitis seen 1-2 weeks following infection with Trypanosoma cruzi (causative agent in Chagas disease). Romana sign is associated with ipsilateral regional lymphadenopathy. History and etymology It is named after Cecilio Felix Romana (1899 - 1997), Argentinian physician, who first described the phenomenon.', 'role': 'assistant'}]