Question: A 69-year-old woman consulted for hemoptotic expectoration. In the two previous months she had low-grade fever, asthenia, anorexia and unquantified weight loss. In the cytological analysis of sputum, hemosiderophages were observed and in the chest radiograph bilateral alveolar infiltrates were observed. Analytically it stood out: Hb 8.2gr / dL, PO2: 58mmHg, creatinine: 5mg / dL, urine: proteinuria +++ microhematuria, cylinders, hematics. ANCAp (antibodies against the cytoplasm of perinuclear neutrophils): positive: anti-glomerular basement membrane antibodies: negative. Antinuclear antibodies: negative. The most likely diagnosis would be: 
 Options:  <1> Idiopathic pulmonary hemosiderosis. <2> Goodpasture syndrome. <3> Systemic lupus erythematosus with severe renal involvement. <4> Classical polyarteritis nodosa. <5> Microscopic polyarteritis.
5