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
What is the main disadvantage of Jiffy dentures? 
Select and explain. 
A. Good esthetics cannot be achieved, B. They take a long time to fabricate, C. Materials used are not durable, D. All of the above
C: Materials used are not durable
Answer: C: Materials used are not durable 
Explanation: Jiffy dentures refers to a type of interim immediate dentures, which are fabricated very quickly using readily available, but temporary materials.