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
NUVA SEAL is: 
Select and explain. 
A. UV activated sealant, B. Self-cure sealant, C. Light cure sealant, D. Flouride releasing sealant
A: UV activated sealant
Answer: A: UV activated sealant 
Explanation: First Generation Sealants:

Polymerized with UV light at a wavelength of 365 nm – cyanoacrylate based material.
Classified as ‘accepted’ by ADA in 1976.
Eg: Alpha seal, Nuva Seal

Failed due to:

Excessively absorbed UV light-prevented complete polymerization of sealant at its depth.
Inconsistency of wavelength from the UV light source.
The potential for retinal damaged with long term exposure to UV light.