Among the four options given below three have similarities. Find the word not matching with others :

Purina

The correct answer is Option (4) – Purina

The word "Purina" does not match the others.

Explanation:

• Retina, cornea, and pupil are all parts of the human eye.
• The retina is the light-sensitive layer of tissue at the back of the eye.
• The cornea is the transparent outer layer of the eye that covers the pupil and iris.
• The pupil is the opening in the center of the iris through which light enters the eye.
• "Purina" does not relate to the anatomy or function of the eye; it might be a term unrelated to eye physiology or anatomy.