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: Pathology
HbA
2
 is raised in - 
Select and explain. 
A. Beta thalassemia trait, B. Sickle cell anemia, C. Hereditory spherocytosis, D. None
A: Beta thalassemia trait
Answer: A: Beta thalassemia trait 
Explanation: HbA2 is raised in thalassemia minor (β-Thalassemia trait).