Ophthalmology is the branch of science in which we study about

The correct answer is C. Eye. Ophthalmology is the branch of medicine that deals with the diagnosis and treatment of diseases and disorders of the eye. It is a subspecialty of medicine that is concerned with the anatomy, physiology, and diseases of the eye. Ophthalmology is a very broad field, and it encompasses a wide range of topics, including the diagnosis and treatment of eye diseases, the surgical treatment of eye disorders, and the management of eye injuries.

The other options are incorrect because they are not related to the eye. The nose is the organ of smell, the tongue is the organ of taste, and the ear is the organ of hearing.