Correct Answer: Smelling

Solution : The correct option is Smelling .

The vomeronasal organs, also known as Jacobson's organs, are connected to the sense of smell but also detect chemical messages called pheromones. They detect pheromones, which are chemical signals generated by members of the same species to communicate information about reproduction, territory and social interactions. While Jacobson's organs detect these chemical cues, the primary olfactory system is in charge of detecting other sorts of odours in the environment.