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: Consider Input: Question: In mammals, Toll-like receptors (TLRs) are receptors: 
 Options:  <1> Signaling. <2> Antigenic <3> Of histocompatibility alleles. <4> Of phagocytosis. <5> Of chemokines.

Output: 1


Input: Consider Input: Question: The reaction of an alkene with metachloroperbenzoic acid causes a cyclic ether which is called: 
 Options:  <1> Furano <2> Dioxane <3> Epoxide <4> Azirano <5> Lactone

Output: 3


Input: Consider Input: Question: Which compound acts as a sulfhydryl buffer and as an antioxidant? 
 Options:  <1> Glycogen <2> Glutamic acid. <3> Glucagon. <4> Glutathione <5> Ascorbic acid.


Output: 4