<prompt> In a case of undifferentiated arthritis, presence of anti-cyclic citrullinated peptide anti CCP indicates strong possibility of which of the following?Rheumatoid arthritisSystemic lupus erythematosisMixed connective tissue disorderReactive arthritis  <response>: Anticitrullinated peptide antibody test Anti ccp test is more specific than rheumatoid factor for diagnosis of rheumatoid arthritis. It may be positive very early in the course of the disease. 