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: Physiology
Percentage of T4 and T3 released from thyroid gland? 
Select and explain. 
A. 50% T4 ; 50% T3, B. 25% T4 ; 75% T3, C. 80% T4 ;20% T3, D. 1000% T4 ;0% T,
C: 80% T4 ;20% T3
Answer: C: 80% T4 ;20% T3 
Explanation: Ans. is 'c' i.e., 80% T4 ;20% T3 ,(Ref: Elsefier's medical laboratory science examination review p.246)Approximately 80% of secreted hormone is T4 & 20% T3 ," .