This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: parasitology, Subject name: Microbiology
[{'content': 'Larval form in stool is found in - \nSelect and explain. \nA. Strongyloides, B. Ancylostoma duodenale, C. Ascaris lumbricoides, D. Necator americanus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Demonstration of rhabdiform larvae In freshly passed faeces is the most impoant and specific method for diagnosis. Larvae may sometimes be present in sputum or duodenal aspirate. Concentration of larvae in faeces may be done by Baermann method which is very sensitive (refer pgno:152 baveja 3 rd edition)', 'role': 'assistant'}]