Assertion :Over population causes a number of socio-economic problems. Reason: A number of bacterial and viral diseases have controlled.

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

1. Rapid population growth leads to the environmental change, it has swelled the ranks of unemployed men and women at an alarming rate, people are being pushed in ecologically sensitive areas such as of and tropical forests, increased food shortage, increased in poverty, illiteracy and crime rates.

2. bacterial and viral diseases have been controlled due to the advent of antibiotics, antiviral drugs and also due to the availability of artificial immunization causing vaccines.

So, the correct option is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion'