Recall : Specific for SLE: anti Sm

another recall :

A 22-year-old woman presents to the clinic with a 2-month history of polyarthralgia, skin rash, mucosal ulcers, and fatigue. Clinical examination reveals a malar rash on her face and active arthritis in several joints. Her lab results are as follows:

Which of the following tests obtained during this visit is most likely to confirm the diagnosis?

A. Anti-Ro (SSA) antibodies
B. Antinuclear antibodies (ANA)
C. Anti-double-stranded DNA (anti-dsDNA) antibodies
D. Anti-ribonucleoprotein (RNP) antibodies

Right is : C. Anti-double-stranded DNA (anti-dsDNA) antibodies