The document defines several medical specialties and their areas of focus: - A neurologist diagnoses and treats nervous system conditions and diseases. - An andrologist deals with diseases and conditions specific to men. - A cardiologist treats heart diseases and abnormalities. - A dentist repairs, extracts, and replaces teeth and treats gum diseases. - A psychiatrist diagnoses and treats mental health conditions using medication and psychotherapy. - A pediatrician specializes in children's diseases. - A veterinarian practices animal medicine. - A hematologist studies and treats diseases of the blood.