Select the true statement regarding frogs (Rana tigrina).
A. Frog is a homeothermic animal
B. Frog drinks about 5 litres H2O per day
C. Poisonous glands are found in the body of frog
D. A very long tail is present in the posterior part of the frog's body.

Hint: A frog is any individual from a diverse and generally carnivorous gathering of short-bodied, tailless creatures of land and water making the order Anura. The most seasoned fossil "proto-frog" showed up in the early Triassic of Madagascar, however molecular clock dating recommends their starting points may stretch out further back to the Permian, 265 million years prior.

Complete answer:
-Frogs are poikilothermic, i.e., cold blooded creatures. Along these lines, frogs need to embrace reasonable standards of conduct to manage their temperature. To heat up, they can move into the sun or onto a warm surface, on the off chance that they overheat, they can move into the shade or embrace a stance that uncovered the base zone of skin to the air.
-They don't drink water as we do. They retain water straightforwardly through their skin in a zone known as the 'drinking patch' situated on their stomach and the underside of their thighs.
-Most amphibians and a few frogs have a total of toxin organs called the parotid organs, situated on the sides of their heads behind the eyes. These organs discharge bodily fluid and a scope of poisons which might be disturbing, unpleasant and that make frogs tricky to hold and offensive or noxious and perilous to its adversaries. In the event that the harmful impact is prompt, the hunter may stop its activity and the frog may get away. On the off chance that the impact grows all the more gradually, the hunter may figure out how to maintain a strategic distance from that species in future.
-Frogs have no tail, besides in the larval stage.

Hence, the correct answer is option (C).

Note: Frog respires in three different manners; cutaneous or skin respiration; buccopharyngeal respiration; pulmonary or lung respiration. The skin of frogs provides an extensive surface for the exchange of gases. It is thin, richly supplied with blood and kept moist by the mucus and water.