This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
Rapid serological diagnostic tests include all except - 
Select and explain. 
A. Latex agglutination, B. Spectrophometry, C. Gel electrophoresis, D. Radioimmunoassay
B: Spectrophometry
Answer: B: Spectrophometry 
Explanation: Spectrophotometry is not a rapid serological test it is a quantitative measurement of the reflection or transmission propeies of a material as a function of wavelength. A spectrophotometer is commonly used for the measurement of transmittance or reflectance of solutions, transparent or opaque solids, such as polished glass, or gases. Ref: www.mayoclinic.com