Columella auris is found in
a)	Rabbit	b)	Frog	c)	Man	d)	All of these

(b)

The middle ear of frog consists of only a single rod shaped bone called columella auris which extend across the tympanic chamber from tympanic membrane to fenestra ovalis. Columella auris is also present in reptiles and birds. It transmits sound to the inner ear and homologous to the mammalian stapes.