30years old pt came to the clinic with brownish discoloration of all his teeth (intrinsic discoloration) & yellowish in U/V light the most likely cause.. tetracycline

30years old pt came to the clinic with brownish discoloration of all his teeth (intrinsic discoloration) & yellowish in U/V light the most likely cause is:

1- flourosis

2- tetracycline.***

3- amelogensis imperfecta

4- dentogensis imperfectea.