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
Each of the following is a feature of papillary hyperplasia except: 
Select and explain. 
A. It is a proliferative bone disease, B. It can be caused by wearing the dentures at night, C. It can be caused by poor oral hygiene, D. It can be caused by an ill-ﬁtting denture
A: It is a proliferative bone disease
Answer: A: It is a proliferative bone disease 
Explanation: Papillary hyperplasia is characterized by multiple papillary projections of the epithelium caused by local irritation, poor-ﬁtting denture, poor oral hygiene, and leaving dentures in all day and night.