Question

What is the normal body temperature of the healthy person in degree celsius ?

Answer 1

A normal body temperature ranges from $36.4^\circ C$ to $37.6^\circ C$. And it is mostly represented in degrees fahrenheit ($^\circ F$). And temperature over $100^\circ F$ means a person has a fever (in this case one should need to consult a doctor).

Complete step by step solution
The average normal body temperature of the healthy person is accepted as $98.6^\circ F$ ($37^\circ C$).
Mostly we represent the body temperature in $^\circ F$ rather than $^\circ C$. Some studies show that the normal body temperature has a wide range from $97^\circ F$($36.1^\circ C$) to $99^\circ F$($37.2^\circ C$). If the body temperature raises over $100.4^\circ F$($38^\circ C$) then the person is suffering from fever.Our body acts like a furnace, that puts out heat all the time. When the amount of heat going out from the body increases or decreases rather than being in a particular temperature range which is $97^\circ F$($36.1^\circ C$) to $99^\circ F$($37.2^\circ C$) then it will results into fever.
Our temperature reading changes based on where (on body) it is being measured. Underarm readings can be a degree lower than the readings found by measuring by mouth. Rectal temperatures usually are up to a degree higher than mouth readings.
A body temperature higher than our normal range is a fever. It is hypothermia when the body temperature dips too low. In both cases there would be a need to consult a doctor.

Note: The normal body temperature can vary from one person to another. Sometimes a normal adult can have a low body temperature such as $36^\circ C$($96^\circ F$) and still can be fit. So it is not fixed for everyone.