Discussion

Match the animals listed in Column I with primary tissue or organ of residence in the host listed in Column II

Column I	Column II
P. Ascaris lumbricoides	(i) Subcutaneous tissue in human
Q. Dracunculus medinensis	(ii) Lymphatic vessels and lymph nodes
R. Enterobius vermicularis	(iii) Small intestine
S. Wuchereria bancrofti	(iv) Caecum or vermiform appendix

Answer: D

The correct match is P-(iii), Q-(i), R-(iv), S-(ii).

Ascaris lumbricoides, the large roundworm, lives as an adult in the small intestine (iii).
Dracunculus medinensis, the guinea worm, lives in subcutaneous tissue; the female emerges through a blister, usually on the leg (i).
Enterobius vermicularis, the pinworm, lives in the caecum and appendix and migrates to the perianal skin to lay eggs (iv).
Wuchereria bancrofti adults live in the lymphatic vessels and lymph nodes, causing lymphatic filariasis and elephantiasis (ii).

Options A, B and C each put the guinea worm or the filarial worm in the wrong tissue.

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