Match the following and choose the correct answer.

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

To find the correct match, let us analyze the common names and characteristics of the organisms listed in List - I and match them with their corresponding terms in List - II:

1. (a) Physalia:
Physalia is commonly known as the Portuguese Man of War. It is a marine hydrozoan organism belonging to the phylum Cnidaria. Therefore, (a) matches with (ii).

2. (b) Limulus:
Limulus (commonly known as the king crab or horseshoe crab) is a well-known Living fossil. It belongs to the phylum Arthropoda. Therefore, (b) matches with (iii).

3. (c) Ancylostoma:
Ancylostoma is commonly known as the Hookworm. It is a parasitic nematode belonging to the phylum Aschelminthes. Therefore, (c) matches with (iv).

4. (d) Pinctada:
Pinctada is commonly known as the Pearl oyster. It is a marine bivalve mollusc belonging to the phylum Mollusca, famous for producing pearls. Therefore, (d) matches with (i).

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

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