Choose the pair in which the words are differently related from the rest.

The correct answer is D. Leg : Lame.

In the other three pairs, the first word is an organ that is used to perceive a certain sense, and the second word is a condition that prevents the person from perceiving that sense. For example, the tongue is used to perceive taste, and blindness prevents a person from perceiving sight.

However, the leg is not an organ that is used to perceive a sense. Instead, it is an organ that is used for movement. Lameness is a condition that prevents a person from walking properly, but it does not prevent them from perceiving any senses.

Therefore, the pair “leg : lame” is the odd one out.