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: Medicine
[{'content': 'Features of Giardiasis -a) Mal absorptionb) Cyst with 4 nucleic) Trophozoite with four nucleid) Common in hypogammaglobulinemia \nSelect and explain. \nA. abd, B. ad, C. bc, D. bcd', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]