To correctly match the items in List I with List II, we need to understand each term and its relationship:

• Common Cold is primarily caused by Rhinoviruses. Hence, A is linked with III.
• Haemozoin is a byproduct of the digestion of blood by parasites such as Plasmodium (which causes malaria). Therefore, B corresponds with I.
• Widal test is a diagnostic test for Typhoid fever, caused by the bacterium Salmonella Typhi. Thus, C matches with II.
• Allergy can be triggered by many allergens, including Dust Mites, which are a common cause of respiratory and dermatological allergies. Consequently, D aligns with IV.

Based on this, the matching should be:

A-III, B-I, C-II, D-IV

Therefore, the correct answer is:

Option C: A-III, B-I, C-II, D-IV