When the Temperature in a Room Drops Too Low,the Thermostat

Multiple Choice

When the temperature in a room drops too low,the thermostat senses it and the furnace turns on.Once the temperature rises to a predetermined level,the furnace turns off.This is analogous to the way sex hormone levels operate on a

A) positive feedback system.
B) negative feedback system.
C) neutral feedback system.
D) None of these choices are correct.