This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Skin
Which of the following is not a test for syphilis: September 2011 
Select and explain. 
A. VDRL, B. Frei test, C. TPHA, D. FTA-Abs
B: Frei test
Answer: B: Frei test 
Explanation: Ans. B: Frei test Frei test is an obsolete intradermal test done for lymphogranuloma venerum