Communicable diseases are the diseases that can spread from one person to another by various means like by contact, through the exchange of body fluids, etc.
Common cold can spread by sneezing in public without covering the mouth. The pathogens can then enter the body of a healthy person through the nostrils when the contaminated air is inhaled.
Chickenpox can spread through contact by touching the fluid from the blisters of the infected person.
Diabetes is a non-communicable disease.
So, the correct option is D.
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