This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
Which of the following methods is not used for measurement of body fluid volumes? 
Select and explain. 
A. Antipyrine for total body water, B. Insulin for extracellular fluid, C. Evans blue for plasma volume, D. 125I-albumin for blood volume
D: 125I-albumin for blood volume
Answer: D: 125I-albumin for blood volume 
Explanation: Albumin tagged with radioactive iodine 131 ie RISA, radioiodinated serum albumin is used. Ref: Textbook of medical physiology by N Geetha, 2nd edition, page no. 117