The unwieldy growth of population leads to the problem of housing and sanitation. In many countries the slums are a (5)_____ to the eyes. Slums grow round big cities and are found with all th

The unwieldy growth of population leads to the problem of housing and sanitation. In many countries the slums are a (5)_____ to the eyes. Slums grow round big cities and are found with all the drawbacks. These are the areas of disease, filth and crime.
(5) ....................