The normal body temperature range in Celsius for a healthy adult is:

The normal body temperature range in Celsius for a healthy adult is:

• A. 35.0 to 36.0°C
• B. 33.5 to 35.5°C
• C. 37.0 to 38.0°C
• D. Approximately 36.1 to 37.2°C

Answer: (D)

Normal body temperature reflects a healthy baseline of heat production and loss, with small natural variation throughout the day and between individuals. For a healthy adult, the resting core temperature typically sits around 36.1–37.2°C. This range captures the usual fluctuations due to circadian rhythm, activity, and measurement method, and it is generally considered the normal baseline. Values significantly lower than this suggest hypothermia, while values higher often indicate fever or infection (fever is commonly defined as about 38°C or higher, though mild elevations can occur in some people or circumstances). Among the options, the range approximately 36.1–37.2°C best represents the normal baseline for a healthy adult, whereas the other ranges are either too cool to be normal or fall into fever or subnormal territory.

Normal body temperature reflects a healthy baseline of heat production and loss, with small natural variation throughout the day and between individuals. For a healthy adult, the resting core temperature typically sits around 36.1–37.2°C. This range captures the usual fluctuations due to circadian rhythm, activity, and measurement method, and it is generally considered the normal baseline. Values significantly lower than this suggest hypothermia, while values higher often indicate fever or infection (fever is commonly defined as about 38°C or higher, though mild elevations can occur in some people or circumstances). Among the options, the range approximately 36.1–37.2°C best represents the normal baseline for a healthy adult, whereas the other ranges are either too cool to be normal or fall into fever or subnormal territory.