Match each disease with its correct type of vaccine:
(a) tuberculosis (i) harmless virus
(b) Whooping cough (ii) inactivated toxin
(c) diphtheria (iii) killed bacteria
(d) polio (iv) harmless bacteria
(a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)
(a) tuberculosis - (iv) harmless bacteria
(b) Whooping cough - (iii) killed bacteria
(c) diphtheria - (ii) inactivated toxin
(d) polio - (i) harmless virus