To match the items in List I with those in List II, we will identify the associations based on known biological relationships:
| List I | List II |
| A. Common cold | III. Rhinoviruses |
| B. Haemozoin | I. Plasmodium |
| C. Widal test | II. Typhoid |
| D. Allergy | IV. Dust mites |
Explanation:
- Common cold is caused by Rhinoviruses, linking A to III.
- Haemozoin is a byproduct formed by the parasite Plasmodium during malaria infection, linking B to I.
- The Widal test is used to diagnose Typhoid, linking C to II.
- Allergy reactions are commonly triggered by substances like Dust mites, linking D to IV.
The correct answer is therefore: A-III, B-I, C-II, D-IV.