Task: Question Answering
Input (English): 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.
Output (English): 2