Darkness : Lamp :: ?:?

Options

A. Fatigue : Exercise
B. Thirst : Water
C. Medicine : Illness
D. Study : Classroom

Explanation

To solve the analogy "Darkness : Lamp :: ?:?", we need to identify the relationship between the first pair of words and apply that relationship to find the correct second pair from the given options.

### Step-by-Step Solution:

1. **Identify the Relationship**:
- The first pair is "Darkness : Lamp". Here, a lamp is an object that provides light, which eliminates darkness. Thus, the relationship is that the second word (lamp) removes or counteracts the first word (darkness).

2. **Analyze the Options**:
- We have four options to consider:
1. Fatigue : Exercise
2. Thirst : Water
3. Medicine : Illness
4. Study : Classroom

3. **Evaluate Each Option**:
- **Option 1: Fatigue : Exercise**
- Exercise does not eliminate fatigue; in fact, exercise can cause fatigue. Therefore, this option does not match the relationship.

- **Option 2: Thirst : Water**
- Water eliminates thirst. When you drink water, it quenches your thirst, similar to how a lamp eliminates darkness. This option matches the relationship.

- **Option 3: Medicine : Illness**
- Medicine is used to treat illness, but it does not eliminate illness directly. Therefore, this option does not match the relationship.

- **Option 4: Study : Classroom**
- A classroom is a place where you study, but it does not eliminate the concept of study. Therefore, this option does not match the relationship.

4. **Conclusion**:
- The only option that maintains the same relationship as "Darkness : Lamp" is "Thirst : Water". Thus, the answer to the analogy is:
- **Thirst : Water**.

### Final Answer:
**Thirst : Water**