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
Which of these pathologies is etiologically different? 
Select and explain. 
A. Isolated cleft palate, B. Cleft lip and palate, C. All are same, D. None of the above
B: Cleft lip and palate
Answer: B: Cleft lip and palate 
Explanation: None