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
[{'content': 'Two alleles expressing in heterozygous state is an example of \nSelect and explain. \nA. Codominance expression, B. Dominant expression, C. Recessive expression, D. Hemizygous expression', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]