Classification — human body parts and senses: choose the single option that does NOT match the others by function or location.

Introduction / Context:
This set mixes facial parts and an internal organ. Three options are external facial parts directly associated with oral/nasal functions and senses; one is an internal central organ unrelated to being a facial feature.

Given Data / Assumptions:

• Tongue → inside the mouth; key to taste and speech articulation.
• Lips → external mouth structure; articulation and sensation.
• Nose → facial organ for smell and breathing.
• Brain → central organ inside the skull; not a facial part.

Concept / Approach:
Group by anatomical location/role: facial/external vs internal central organ.

Step-by-Step Solution:
1) Tongue/Lips/Nose → face/oral–nasal region; sensory/expressive roles.2) Brain → internal CNS organ; not a facial structure.3) Therefore “Brain” is the odd item.

Verification / Alternative check:
Ask which could be seen externally on a face (at least in part): lips, nose, and tongue (when exposed) vs brain (never external).

Why Other Options Are Wrong:
They cluster around facial/sensory functions.

Common Pitfalls:
Choosing “lips” as not a sense organ; the intended grouping is facial/oral–nasal anatomy, not strictly the five-sense organs list.

Final Answer:
Brain