Reflex: refers to the organism's regular response to stimuli through the nervous system. Unconditional reflex is a congenital, non-learning reflex. It is a simple reflex without any conditions, which is an instinctual behavior. Conditional reflex is the organism's acquired What you learn in life is only reflections that occur under certain conditions. Which of the following meets the definition of unconditional reflection? ? ['Puppies that often eat a dog food called the Beibei brand will drool when they smell or see this dog food.', 'The kindergarten teacher always asks the children to sing when the music sounds. On one occasion, the teacher did not let the children sing, but the children sang along.', 'The right side of the horse racing "Marine Biscuit" was often beaten by a trainer when he was a child, so he will go crazy when he sees a whip on the right side.', "Xiao Wang went out to work, accidentally lost his belongings, didn't eat for a few days, and when he was very hungry, his stomach cooed and he drooled when he saw the food."]