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'.

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.
1

Question: The proportion of environmental variance due to the influences that a person receives from their family environment and that are shared by the rest of their family: 
 Options:  <1> It is the specific variance. <2> It is called genotypic variance. <3> It matches the heritability. <4> It is dismissed in the investigations. <5> It is the variance coming from the shared environment.
5

Question: Derived from blood monocytes: 
 Options:  <1> Protoplasmic astrocyte. <2> Fibrous astrocyte. <3> Oligodendrocyte <4> Microgliocyte <5> Satellite cell.

4