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: Gynaecology & Obstetrics
Most sensitive method of quantitative measurement of human chorionic gonadotrophin : 
Select and explain. 
A. Paper chromatography, B. Latex paicle test, C. Radio - immunoassay, D. Male toad test
C: Radio - immunoassay
Answer: C: Radio - immunoassay 
Explanation: Radio - immunoassay