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
Lower first molar has which of the following occlusal shapes 
Select and explain. 
A. Pentagonal, B. Trapezoid, C. Rectangular, D. Any of the above
D: Any of the above
Answer: D: Any of the above 
Explanation: In previous question only one has to be selected so answer should be Pentagonal. But other occlusal forms are also found in lower first molar.