The correct answer is: A. ophthalmologist : cataract
A psychologist is a medical professional who specializes in the diagnosis and treatment of mental disorders. Neurosis is a mental disorder that is characterized by anxiety, depression, and other emotional problems. An ophthalmologist is a medical professional who specializes in the diagnosis and treatment of eye diseases. A cataract is a clouding of the lens of the eye that can cause vision problems.
The other options are not correct because they do not represent a similar relationship to the one expressed in the original pair of words. A dermatologist is a medical professional who specializes in the diagnosis and treatment of skin diseases. A fracture is a break in a bone. An infant is a child who is less than one year old. A pediatrician is a medical professional who specializes in the diagnosis and treatment of children’s health problems. A rash is a skin condition that is characterized by redness, itching, and swelling. An orthopedist is a medical professional who specializes in the diagnosis and treatment of disorders of the musculoskeletal system. Measles is a contagious viral disease that is characterized by fever, cough, runny nose, and a red rash.