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
Which of the following is not seen on hemoglobin electrophoresis in sickle cell anemia - 
Select and explain. 
A. HbA, B. HbA2, C. HbF, D. HbS
A: HbA
Answer: A: HbA 
Explanation: None