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: Dental
[{'content': 'Class IV Kennedy Classiﬁcation is: \nSelect and explain. \nA. Bilateral edentulous area located posterior to the remaining natural teeth., B. Unilateral edentulous area located posterior to the remaining natural teeth., C. Unilateral edentulous area with natural teeth remaining both anterior to the  remaining natural teeth and posterior to it., D. A single but bilateral (crossing the midline) edentulous area located anterior to the  remaining natural teeth.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The following is the Kennedy classification:\nClass I: Bilateral edentulous areas located posterior to the natural teeth.\nClass II: A unilateral edentulous area located posterior to the remaining natural teeth.\nClass III: A unilateral edentulous are with natural teeth remaining both anterior and posterior to it.\nClass IV: A single, but bilateral (crossing the midline),\xa0edentulous area located anterior\xa0to the remaining natural teeth.\nRef: McCrackens Removable Partial Denture Ed 13th Pg 17', 'role': 'assistant'}]