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': 'True ankyloglossia occurs as a result of \nSelect and explain. \nA. Union between tongue and floor of mouth/ventral surface of tongue, B. Absence of lingual frenum, C. Lingual frenum attached to the tip of tongue, D. Short lingual frenum', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]