In the following analogy based on human body parts, Heart is related to Organ in a certain way. Using the same logic, which of the following pairs correctly completes the analogy ? : ?

Introduction / Context:
This question tests basic knowledge of the human body and classification relationships. The pair Heart and Organ expresses that the heart is an organ. We must find another pair that mirrors this pattern. Class inclusion analogies like this require the learner to recognise that one term is a specific example of the general class represented by the second term.

Given Data / Assumptions:

• Given pair: Heart : Organ
• Options: Bones : Calcium, Eyes : Organ, Leg : Feet, Ear : Sense.
• We assume standard biological and everyday meanings.

Concept / Approach:
In Heart : Organ, the relationship is that a heart is a type of organ in the human body. So, item to category is the underlying link. For the second pair, we need an option where the first term is another example of the general category described by the second term. We must avoid pairs that express other kinds of relations such as part to part or material to object.

Step-by-Step Solution:
Step 1: Express the first relation in words. Heart is an organ. Step 2: Evaluate each option and rephrase their relations. Step 3: Bones : Calcium shows a material relationship. Bones contain calcium but bones are not a type of calcium. Step 4: Eyes : Organ can be phrased as eyes are organs of sight, which fits the same item to category relation as heart is an organ. Step 5: Leg : Feet is a part to part relation within limbs, not item to category. Ear : Sense relates an organ to a function, not organ to category. Step 6: Conclude that Eyes : Organ best matches the pattern of Heart : Organ.

Verification / Alternative check:
We can check the logic by constructing parallel sentences. "Heart is an organ" is directly analogous to "Eyes are organs". This symmetry is absent in the other options. Bones are not a type of calcium; they merely contain it. Leg is not a type of feet; rather, feet are parts at the end of the legs. Ear is an organ that provides the sense of hearing, so the second term is a function rather than a category. Only Eyes : Organ matches the same class inclusion relationship.

Why Other Options Are Wrong:
Bones : Calcium mixes object and constituent material, not object and category. Leg : Feet compares two body parts at different positions rather than classifying one as a type of the other. Ear : Sense compares an organ with an abstract property or ability, again not item to category. Thus all these pairs violate the pattern defined by Heart : Organ.

Common Pitfalls:
Students may be tempted by Ear : Sense because it mentions sense, which is indirectly linked to organs like heart and brain. However, analogy questions require matching the type of relationship exactly, not choosing pairs that feel vaguely related thematically. Always convert each pair into a short sentence and compare the sentence structures. This method quickly reveals whether two pairs share the same logical relation.

Final Answer:
The pair that correctly completes the analogy Heart : Organ :: ? : ? is Eyes : Organ.