Select the correct pair :-
(I) Methanogen `rarr` occurs in swampy ares
(II) Halophiles `rarr` have pigments but they are not photosynthetic
(III) Thermoacidophiles `rarr` Mostly parasitic

Options

A. I and II
B. II and III
C. I and III
D. All of these

Answer

To solve the question, we need to analyze each statement regarding the organisms mentioned: Methanogens, Halophiles, and Thermoacidophiles.

### Step-by-Step Solution:

1. **Evaluate Statement I: Methanogen occurs in swampy areas.**
- Methanogens are microorganisms that produce methane as a by-product of their metabolism. They are commonly found in anaerobic environments, such as the guts of animals and swampy areas. Therefore, this statement is **correct**.

2. **Evaluate Statement II: Halophiles have pigments but they are not photosynthetic.**
- Halophiles are extremophiles that thrive in high salt concentrations. They do contain pigments, such as carotenoids, which can give them a reddish color. However, these pigments do not function in photosynthesis. Thus, this statement is also **correct**.

3. **Evaluate Statement III: Thermoacidophiles are mostly parasitic.**
- Thermoacidophiles are organisms that thrive in extremely acidic environments and at high temperatures. They are not primarily known to be parasitic; instead, they often derive energy from inorganic compounds. Therefore, this statement is **incorrect**.

### Conclusion:
Based on the evaluations:
- Statement I is correct.
- Statement II is correct.
- Statement III is incorrect.

Thus, the correct pairs are **I and II**.

### Final Answer:
The correct answer is **1 and 2**.

---