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': 'The egg which of the following parasites consist of polar filaments arising from either end of the ambrophore - \nSelect and explain. \nA. Taenia saginata, B. Taenia solium, C. Echinococcus granulosus, D. Hymenolepis nana', 'role': 'user'}, {'content': 'Answer: D \nExplanation: egg spherical or oval contains a smooth thin colorless outer membrane and an inner membrane the space between the 2 membranes contains yolk granules and 4 to 8 polar filaments arising from two knobs on embryophore (refer pgno:108 baveja 3 rd edition)', 'role': 'assistant'}]