In substitution type of questions, some particular objects are assigned code names. Then a question is asked that is to be answered in the code language.
If eye is called hand, hand is called mouth, mouth is called ear, ear is called nose and nose is called tongue, with which of the following would a person hear ?
A person hears with his 'ear'. But as per the given information, 'ear' is called 'nose'.
So, a person will hear with the 'nose'.
Hence, the answer is (c).