Multiple choice Which of the following is the only poisonous lizard in the world? Ophiosaurus Varanus Heloderma Draco Reveal answer Fill a bubble to check yourself C Correct answer Explanation Heloderma is the genus containing the Gila monster and Mexican beaded lizard, the only venomous lizards in the world. They produce neurotoxic venom in glands in their lower jaws and deliver it through grooved teeth.