Match the following and choose the correct answer from the options given below.

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

To solve the matching, we need to identify the most appropriate connection between each organism in List I and the description or category in List II.

(a) Physalia is the scientific name of the Portuguese Man of War, a colonial marine organism that looks like a jellyfish but is actually a siphonophore. Therefore it matches (ii) Portuguese Man of War.

(b) Limulus refers to the Atlantic horseshoe crab, a species that has remained virtually unchanged for hundreds of millions of years. Such organisms are commonly called living fossils. Hence it matches (iii) Living fossil.

(c) Ancylostoma is a genus of parasitic nematodes that cause hookworm infections in humans and animals. This directly corresponds to (iv) Hookworm.

(d) Pinctada is a genus of oysters known for producing natural pearls. These are the classic pearl oysters, so the correct match is (i) Pearl oyster.

Putting the matches together gives the final answer:

a – ii, b – iii, c – iv, d – i