Final answer:
Internal Medicine is a broad medical specialty that addresses a wide range of adult diseases and can further branch out into various subspecialties, making it the correct answer for the provided question.
Step-by-step explanation:
Internal Medicine is considered the broader and more general specialty area that encompasses various subspecialties. This field of medicine deals with the prevention, diagnosis, and treatment of adult diseases. Physicians specializing in internal medicine are often called "internists" and are experts in managing patients with complex, chronic, and multi-system diseases. These physicians can further specialize in fields such as cardiology, gastroenterology, or endocrinology, among others. Unlike fields like Pediatric Dentistry, which is specialized solely for dental care in children, or Orthopedic Surgery, which focuses on musculoskeletal issues, internal medicine encompasses a wide range of adult health concerns and can serve as a foundation for further specialization.