Use your brain power :
What is the correlation between the normal body temperature of humans which is `37^@C` and the optimum temperature for the growth of microorganisms, `15^@C` to `35^@C`?

Explanation

Bacteria grow maximally in the temperature range between `15^@C` to `35^@C`. In human body their growth does not take place with the same, the same intensity. If any microbe enters our body, the temperature automatically rises resulting into fever which kills these disease causing microbes. Thus naturally man is protected against bacterial attacks.