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: The determination of cyanide by the Liebig method is based on the addition of a silver nitrate standard solution:
Options: <1> Until complete precipitation of silver cyanide. <2> Until the precipitation of silver cyanide begins. <3> Until the appearance of a red precipitate of silver chromate. <4> Until the AgCN complex is quantitatively formed. <5> Until the precipitation of silver iodide, yellow.
2

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: In a renal transplant patient, which of the following characteristics is the characteristic of acute renal rejection?
Options: <1> Interstitial infiltrate of B lymphocytes. <2> Preferably infiltrated with T lymphocytes in the renal interstitium and in the renal tubules. <3> Fibrosis and tubular atrophy. <4> Proliferative glomerulonephritis without affecting the interstitium. <5> Presence of circulating antidonant antibodies and renal infarcts.
2