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# Which of the following is a heterocyclic triamine with formaldehyde?

$\begin{array}{1 1}(a)\;\text{Melamine formaldehyde resin}\\(b)\; \text{Navolac}\\(c)\;\text{ Bakelite}\\(d)\;\text{Neoprene}\end{array}$

Melamine formaldehyde resin is a polymer formed by the condensation of melamine which is heterocyclic triamine with formaldehyde
Hence (a) is the correct answer.