Question: A 38-year-old man consulted for dyspnea and hemoptysis. Blood tests have creatinine 7 mg / dl, urea 250 mg / dl and anti-MBG (anti-glomerular basement membrane antibodies) positive high titer. A renal biopsy was performed, showing crescents in 75% of the glomeruli, and in the immunofluorescence a linear Ig deposition pattern appeared. Which of the following is the correct answer? 
 Options:  <1> It is an Ig A Nephropathy with acute renal failure. <2> The performance of plasmapheresis would be indicated. <3> It is a membranous glomerulonephritis. <4> Mycophenolate mofetil is the initial treatment of choice. <5> Glomerular involvement is caused by the presence of circulating immune complexes.
2