<prompt> According to WHO ,the feature of class II lupus isTransient proteinuriaMassive proteinuriaHematuriaRBC casts  <response>: Ref Robbins 9e p222 Mesangial proliferative lupus nephritis class II is seen in 10 to 25 of cases and is associated with mild clinical symptoms. Immune complexes deposit in the mesangium, with a mild to moderate increase in the mesangial matrix and cellularity 