Match the following :

	List-I		List-II
(a)	Physalia	(i)	Pearl oyster
(b)	Limulus	(ii)	Portuguese Man of War
(c)	Ancylostoma	(iii)	Living fossil
(d)	Pinctada	(iv)	Hookworm

Choose the correct answer from the options given below.

The correct option is a-(ii), b-(iii), c-(iv), d-(i).

To find the correct match, let us look at the biological classification and common names of each organism listed in List-I:

1. Physalia:
Commonly known as the Portuguese Man of War. It belongs to the phylum Cnidaria (Coelenterata). It is not a single organism, but a colonial siphonophore made up of specialized individual zooids. Thus, (a) matches with (ii).

2. Limulus:
Commonly known as the King Crab, it is regarded as a living fossil. It belongs to the phylum Arthropoda. Living fossils are organisms that have remained relatively unchanged structurally over millions of years. Thus, (b) matches with (iii).

3. Ancylostoma:
Commonly known as the Hookworm. It is an endoparasite that infects the small intestine of humans and other mammals, belonging to the phylum Aschelminthes (Nematoda). Thus, (c) matches with (iv).

4. Pinctada:
Commonly known as the Pearl oyster. It is a marine bivalve mollusc belonging to the phylum Mollusca, well-known for its ability to produce cultured pearls. Thus, (d) matches with (i).

Combining these matches, we get:
a-(ii), b-(iii), c-(iv), d-(i)