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
Kalu, a 6-year-old child, received tetracycline. Noticeable discoloration will be seen in: 
Select and explain. 
A. Premolars, incisors and 1st molars, B. Canine and 2nd molars, C. Canines, premolars and 2nd molars, D. Incisors and 1st molars
C: Canines, premolars and 2nd molars
Answer: C: Canines, premolars and 2nd molars 
Explanation: None