Choose the odd one out.

Correct — D.
Rule: three are parts on the outside of an animal's body, one is an organ inside it.

Feathers, claws and ears are on the outside of the body.
The lung is an internal organ, inside the chest, used for breathing.

The internal organ is the odd one → option (d).

Why the others are wrong

• (a)
  Feathers — Feathers grow on the outside of a bird's body, like claws and ears. Removing them would leave the lung, an internal organ, inside a group of outer parts.
• (b)
  Claw — Claw is a hard, curved nail at the tip of a toe, seen on birds, cats and many reptiles. It sits on the outside of the body, with feathers and ears.
• (c)
  Ear — Ear opens on the outside of the head, and in mammals has a visible outer flap, so it groups with feathers and claws. The lung has no outside part.

Word classification asks for the feature three items share. Name the group, then test each item against it.

Here feathers, claws and ears are all external body parts: you can see them on an animal from the outside. The lung is an internal organ, in the chest, that takes in air. That puts the lung outside the group.

Key facts

• The lungs are the organs of breathing and lie in the chest.
• Among living animals, feathers are found only on birds.
• Claws are hard, curved nails at the tips of the toes of many birds, reptiles and mammals.

Common traps

• Picking Feathers because it is the one plural word among the four
• Picking Feathers as the bird-only part, a grouping the key does not take
• Counting the ear as internal because of the inner ear, which splits the four two against two

No directly related past PYQ was found.