Select the correct option that represents examples of the following types of animals.
(i) Roundworm
(ii) Fish possessing poison string
(iii) A limbless amphibian
(iv) An oviparous mammal

Options

A. `{:("(i)","(ii)",("iii"),"(iv)"),("Palaemon","Labeo rohita","Salamander","Kangaroo"):}`
B. `{:("(i)","(ii)",("iii"),"(iv)"),("Nereis","Torpedo","Hyla","Pteropus"):}`
C. `{:("(i)","(ii)",("iii"),"(iv)"),("Hirudinaria","Pristis","Bufo","Delphinus"):}`
D. `{:(" (i)","(ii)",("iii"),"(iv)"),(underset("lumbricoides")("Ascaris"),"Sting ray","Ichthyophis","Duck-billed platypus"):}`

Answer

To answer the question regarding examples of specific types of animals, we will go through each type one by one and identify the correct examples.

### Step-by-Step Solution:

1. **Identify a Roundworm:**
- Roundworms are a type of parasitic worm. The most common example of a roundworm is **Ascaris lumbricoides**, which causes the infection known as Ascariasis.
- Therefore, for the roundworm, the correct example is **Ascaris**.

2. **Identify a Fish Possessing a Poison Sting:**
- A fish that possesses a poison sting is commonly known as a stingray. The scientific name for this type of fish is **Torpedo**.
- Thus, the correct example for a fish possessing a poison sting is **Stingray**.

3. **Identify a Limbless Amphibian:**
- Limbless amphibians belong to a group known as caecilians. An example of a limbless amphibian is **Ichthyophis**.
- Hence, the correct example for a limbless amphibian is **Ichthyophis**.

4. **Identify an Oviparous Mammal:**
- Oviparous mammals are those that lay eggs instead of giving birth to live young. The most well-known example of an oviparous mammal is the **platypus**.
- Therefore, the correct example for an oviparous mammal is **Duck-billed Platypus**.

### Final Answer:
- (i) Roundworm: **Ascaris**
- (ii) Fish possessing poison sting: **Stingray**
- (iii) A limbless amphibian: **Ichthyophis**
- (iv) An oviparous mammal: **Duck-billed Platypus**