The egg which of the following parasites consist of polar filaments arising from either end of the ambrophore?
Taenia saginata
Taenia solium
Echinococcus granulosus
Hymenolepis nana
Ans. is 'd' i.e., H. nana . Egg of H. nana - Spherical or oval - Two distinct membrane, (a) outer membrane (b) inner embryophore - Polar filaments emanating from little knobs at either end of embryophore. - Floats in saturated solution of common salt.