Match the following parts of a neuron to their respective functions.

(A) First Level Cause	(i) Improper santination
(B) Second Level Cause	(ii) Pathogens
(C) Third Level Cause	(iii) Malnutrition

The correct option is B A-ii;B-iii;C-i
Diseases could be caused and categorised as follows:
First level cause:
The agent or factor that actually causes the diseases is called immediate or primary cause of the disease.
Microbes which cause diseases are known as pathogens and they are known as first level cause of disease.
Second level cause:
These causes either make a person prone to catch a disease or create condition that promote susceptibility to a disease.
Malnutrition and genetic abnormalities are the second level cause of disease.
Third Level cause:
Factors such as public health services such as improper sanitation and unhealthy drinking or poverty constitutes the third level cause of the diseases.
Whereas water are third level cause of disease.