Reflex refers to the regular response of an organism to stimuli with the help of the nervous system. Unconditioned reflex is an innate reflex that can be learned without learning. It is a simple reflex without any conditions, and it is an instinctive behavior. Conditioned reflexes are learned by organisms in their acquired life, only those that occur under certain conditions.
The statement 'The right side of the racehorse A was often beaten by the trainer when he was young, so he went crazy when he saw someone on the right side lifting the whip' fits the definition of unconditional reflection.