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: Microbiology
Which of the following statement is true ? 
Select and explain. 
A. Paul Bunnell test is used to diagnose measles, B. Rose Waaler test is a complement fixation test, C. Indirect hemagglutination test is less sensitive than gel diffusion test, D. Antigen antibody reaction cannot occur in the absence of electrolytes
D: Antigen antibody reaction cannot occur in the absence of electrolytes
Answer: D: Antigen antibody reaction cannot occur in the absence of electrolytes 
Explanation: Ans. is 'd' i.e., Antigen Antibody reaction cannot occur in the absence of electrolytes