Definition: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Input: Question: Where are baroreceptors located that play a more important role in regulating blood pressure? 
 Options:  <1> Vessels of the medulla oblongata. <2> Coronary arteries <3> Vena cava <4> Carotid arteries. <5> Renal arteries
