Final answer:
The most accurate thermometer for measuring body temperature is the infrared ear thermometer.
Step-by-step explanation:
According to the provided information, the most accurate thermometer for measuring body temperature is the infrared ear thermometer. This type of thermometer uses infrared astronomy technology to measure the amount of energy emitted by the eardrum, similar to how the temperature of stars and planets is measured. It avoids contact with mucous membranes, reducing the risk of cross infection, and allows for rapid temperature measurement.