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
Two alleles expressing in heterozygous state is an example of 
Select and explain. 
A. Codominance expression, B. Dominant expression, C. Recessive expression, D. Hemizygous expression
A: Codominance expression
Answer: A: Codominance expression 
Explanation: None