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: Medicine
The most impoant diagnositic feature for beta thalassemia trait 
Select and explain. 
A. Raised HbF, B. Reduced MCH, C. Reduced MCV, D. Raised HbA2
D: Raised HbA2
Answer: D: Raised HbA2 
Explanation: Ans. is 'd' i.e., Raised HbA2