This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
Which of the following most closely represents the lowest detection limit for third generation TSH Assays- 
Select and explain. 
A. 0.4 mlU/L, B. 0.04 mlU/L, C. 0.004 mlU/L, D. 0.0004 mlU/L
B: 0.04 mlU/L
Answer: B: 0.04 mlU/L 
Explanation: The current standard of care calls for the use of the third generation TSH assays with functional sensitivity of <0.02 mIU/L , a level of sensitivity necessary for detecting degrees of TSH suppression. The current third generation chemiluminescent immunoassays provide excellent sensitivity and specificity as well as the necessary low limits of detection and quantification. Ref - semantischolar.org