What is the most venomous type of dragon?

The most venomous type of dragon is Komodo dragon

Explanation:

Komodo dragons kill using a one-two punch of sharp teeth and a venomous bite. Any animal it bites will likely die within days. The small island of Komodo is considered as the home to the Komodo dragon. The effectiveness of the Komodo dragon bite is a combination of specialized teeth and poison. Komodo dragons are the largest lizards in the world.

While dragons are non-existant today, research finds that the Komodo dragon has the capability to kill their prey with venom. They secrete venomous proteins in their mouths, venom but to a degree basically. The Komodo is also the world's largest living lizard, or perhaps "dragon".