Match List-I with List-II and choose the correct answer from the options given below.

List - I	List - II
(a) Filariasis	(i) Haemophilus influenzae
(b) Amoebiasis	(ii) Trichophyton
(c) Pneumonia	(iii) Wuchereria bancrofti
(d) Ringworm	(iv) Entamoeba histolytica

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

To match List-I (Diseases) with List-II (Pathogens/Causative organisms), let us analyze each disease step-by-step:

(a) Filariasis: Also known as lymphatic filariasis or elephantiasis, this disease is caused by filarial worms. The most common causative organism is the helminth parasite Wuchereria bancrofti. Therefore, (a) matches with (iii).

(b) Amoebiasis: Also known as amoebic dysentery, this is a gastrointestinal infection caused by the protozoan parasite Entamoeba histolytica. Therefore, (b) matches with (iv).

(c) Pneumonia: This is an infection that inflames the air sacs in one or both lungs. It is commonly caused by bacteria such as Streptococcus pneumoniae and Haemophilus influenzae. Therefore, (c) matches with (i).

(d) Ringworm: This is a common fungal skin infection. It is caused by fungi belonging to the genera Trichophyton, Microsporum, or Epidermophyton. Therefore, (d) matches with (ii).

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