Answer: Chemoreceptors
Explanation: Chemoreceptors is a sense organ, or one of its cells (such as those for the sense of taste or smell), that can respond to a chemical stimulus; a chemosensor. Chemosensors converts chemical signals and generates biological signals. In this case, a taste receptor is used which is the tongue.
The two main classes of receptors are direct chemoreceptor(taste) and distance chemoreceptor(olfactory).