Task: Question Answering
Input (English): Question: The 2-microglobulin: 
 Options:  <1> It is a low molecular weight immunoglobulin. <2> It is found in high concentration in platelets. <3> It filters freely through the glomerulus and is secreted by the tubule. <4> It is absent in urine. <5> It is found on the surface of all nucleated cells.
Output (English): 5