Concept:
This question is based on classification of human body parts.
Step 1: Analyze each option.
Ears → sense organ (hearing)
Skin → sense organ (touch)
Tongue → sense organ (taste)
Heart → internal organ (pumping blood)
Step 2: Identify the difference.
Ears, Skin, and Tongue are sense organs.
Heart is not a sense organ, but part of the circulatory system.
Hence, Heart is the odd one out.