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: Microbiology
[{'content': 'Which of the following infestation leads to malabsorption - \nSelect and explain. \nA. Giardia lamblia, B. Ascaris lumbricoides, C. Necator Americanus, D. Ancylostoma duodenale', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Disease manifestations of giardiasis range from asymptomatic carriage to fulminant diarrhea and malabsorption.\n\nNote: Ancylostoma duodenale also causes malabsorption, but only in children. On the other hand, Giardia causes malabsorption both in children as well as in adults.', 'role': 'assistant'}]