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
Talon cusp can be seen in: 
Select and explain. 
A. Mohr syndrome, B. Rubinstein Taybi syndrome, C. Sturge - Weber syndrome, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Talon cusp is an additional cusp that is usually located on the lingual surface of anterior teeth. It extends atleast half the distance from the cemento-enamel junction to the incisal edge. It is composed of normal enamel and dentin and contains a horn of pulp tissue.
It is seen in: 

Mohr syndrome
Rubinstein Taybi syndrome
Sturge-Weber syndrome