This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology Pa 2 ( Hybridoma Technology, Complement Pathways, Interferon, Structure and Functions of Immune Cells ), Subject name: Microbiology
Rose-Waaler test is a? 
Select and explain. 
A. Co-agglutination test, B. Latex agglutination test, C. Slide agglutination test, D. Haemagglutination test
D: Haemagglutination test
Answer: D: Haemagglutination test 
Explanation: Rose-Waaler test is a passive haemagglutination test. It is done in rheumatoid ahritis. Autoantibody (RA factor) in the serum acts as antibody to gamma globulin. RA factor can agglutinate red cells coated with globulins.