This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetics, Subject name: Pathology
[{'content': 'ABO blood group inheritance is an example of: \nSelect and explain. \nA. Codominance, B. Mitochondrial inheritence, C. Allelic exclusion, D. Sex-linked Inheritance', 'role': 'user'}, {'content': 'Answer: A \nExplanation: When both of the alleles of a gene pair contribute to the phenotype, this is called as codominance. Good examples of codominant inheritance are: Histocompatibility Blood group antigens', 'role': 'assistant'}]