Which part is least associated with respiration or digestion?

Which part is least associated with respiration or digestion?

• A. Nostril / nose
• B. Mouth
• C. Lungs
• D. Eye

Answer: (D)

Breathing and eating involve specific body parts, and the eye doesn’t participate in either process. Breathing uses the airways and lungs—the nostrils, nose, mouth (as a secondary airway), and the lungs themselves. Digestion starts in the mouth and proceeds through the digestive tract to break down food. The eye, by contrast, is used for vision and has no role in gas exchange or food processing. The only related note is tear drainage into the nasal area, which is a structural link, not a functional part of respiration or digestion. Therefore, the eye is the part least associated with either respiration or digestion.

Breathing and eating involve specific body parts, and the eye doesn’t participate in either process. Breathing uses the airways and lungs—the nostrils, nose, mouth (as a secondary airway), and the lungs themselves. Digestion starts in the mouth and proceeds through the digestive tract to break down food. The eye, by contrast, is used for vision and has no role in gas exchange or food processing. The only related note is tear drainage into the nasal area, which is a structural link, not a functional part of respiration or digestion. Therefore, the eye is the part least associated with either respiration or digestion.