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
True ankyloglossia occurs as a result of 
Select and explain. 
A. 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
A: Union between tongue and floor of mouth/ventral surface of tongue
Answer: A: Union between tongue and floor of mouth/ventral surface of tongue 
Explanation: None