Which statement about the left and right lungs is true?
a. both lungs have a horizontal fissure.
b. only the left lung has a superior lobe.
c. only the right lung has an inferior lobe.
d. both lungs have an oblique fissure.

d. Both lungs have an oblique fissure.

Explanation:

Lungs are the respiratory organs located in the thoracic cavity in the human body. Lungs are in pair present on either side of heart. The left lung has two lobes superior and inferior lobes. The two lobes are separated by an oblique fissure.

Right lung is divided into three lobes superior, middle and inferior lobes. The right lung has both oblique and horizontal fissures which divide right lung into three lobes. The fissures allows expansion of whole lung uniformly to take up more air during breathing.  

Thus, both lungs have an oblique fissure.

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