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
Hormones are best assessed by? 
Select and explain. 
A. Flowcytometry, B. Electrophoresis, C. ELISA, D. RIA
D: RIA
Answer: D: RIA 
Explanation: Radioimmunoassay (RIA ) permits the measurement of analytes up to picogram quantities. RIA and its modifications have versatile applications in various areas of biology and medicine, including quantitation of hormones, drugs, tumor markers. Reference : Anathanarayan & paniker's 9th edition, pg no:113 <\p>