Respiratory organs of whale are

The correct option is A

Lungs

The correct option is A.

Explanation of correct option:

1. Whales are aquatic animals but they belong to the mammal family.
2. Because they are animals, whales and dolphins also breathe air into their lungs as humans do.
3. Since they lack gills, they cannot breathe underwater as fish can.
4. They breathe through a blowhole, which is a pair of nostrils on top of their heads.
5. The whale's lungs have more alveoli and a larger surface area for more effective gas exchange thanks to the two layers of capillaries that surround them.
6. So, they possess lungs for respiration.

Explanation of incorrect options:

Option B:

1. Book lungs are the respiratory organs in arthropods.
2. Arthropods are the shelled crustaceans that include insects, prawns etc.

Option C:

1. Skin is the largest body organ that protects the body from germs and regulates the temperature.
2. Skin doesn't act as a respiratory organ in the mammalian system

Option D:

1. Gills are the respiratory organs of fish, molluscs, insects, and a few amphibians.

Final answer: Respiratory organs of a whale are the lungs.