<prompt> Endorphin release causes -AnalgesiaAllodyniaHyperalgesiaNone of the above  <response>: Ans. is a i.e., Analgesia o Primary action of endorphin b-endorphin is to inhibit pain.o Neurons containing b--endorphin descend from the hypothalamus to terminate on periaquenductal gray matter of midbrain. Periaqueductal gray matter send enkephalinergic and dynorphinergic neuron to medulla to inhibit pain by stimulating raphe nucleus. 