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'.

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

A: 1
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Q: Question: Of the following pairs of surface molecules, what is used by the virgin T lymphocytes to extravasate to the lymph node? 
 Options:  <1> CCR7 and L-selectin. <2> VCAM and L-selectin. <3> CCR7 and ICAM-1. <4> CCR9 and L-selectin. <5> CCR4 and VCAM-1.

A: 1
****
Q: Question: Echinocandins are antifungal compounds that act by inhibiting: 
 Options:  <1> The synthesis of ergosterol. <2> The synthesis of the cell wall. <3> The synthesis of DNA. <4> The synthesis of proteins. <5> The formation of microtubules.

A:
2
****