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
Gene for ectodermal dysplasia with cleft lip and palate 
Select and explain. 
A. ED-1, B. GJB6, C. PVRL1, D. R P73
C: PVRL1
Answer: C: PVRL1 
Explanation: None