Only poisonous mammal or monotreme mammal is

Options

A. Ornithorhynchus
B. Echidna
C. Guinea pig
D. Snake

Answer

A

Explanation

The platypus is one of the few living mammals to produce venom. Males have a pair of spurs on their hind limbs which secrete venom that is only seasonally active to breeding season. This venom is not lethal to humans.