Match the following and choose the correct answer.

	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

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

To match the organisms listed in List-I with their common names or characteristics in List-II, let us analyze each item step-by-step:

(a) Physalia: Physalia is a genus of marine organisms belonging to the phylum Cnidaria. Its most well-known species is Physalia physalis, commonly referred to as the Portuguese Man of War due to its resemblance to an 18th-century Portuguese warship at full sail. Therefore, (a) matches with (ii).

(b) Limulus: Limulus, commonly known as the horseshoe crab, belongs to the phylum Arthropoda. It is often referred to as a Living fossil because it has remained virtually unchanged for millions of years. Therefore, (b) matches with (iii).

(c) Ancylostoma: Ancylostoma is a genus of parasitic nematodes (roundworms) belonging to the phylum Aschelminthes. It is commonly known as the Hookworm, which infects the small intestine of hosts. Therefore, (c) matches with (iv).

(d) Pinctada: Pinctada is a genus of saltwater oysters belonging to the phylum Mollusca. These marine bivalve mollusks are famous as the Pearl oyster, used for cultivating cultured pearls. Therefore, (d) matches with (i).

Combining all the correct matches:
(a) → (ii)
(b) → (iii)
(c) → (iv)
(d) → (i)