What are pharmaceuticals primarily used for?

Pharmaceuticals are primarily used for diagnosing, treating, or curing diseases, which is the essence of their role in healthcare. They are chemical compounds or biological products designed to interact with biological systems to alleviate symptoms, manage health conditions, or eradicate pathogens. This focus on health and disease management underscores the critical importance of pharmaceuticals in improving quality of life and enhancing patient outcomes.

The other options, while relevant to their respective fields, do not accurately capture the primary function of pharmaceuticals. Enhancing agricultural productivity relates more to agrochemicals or fertilizers, which are important in farming but are not classified as pharmaceuticals. Creating laboratory equipment pertains to the manufacturing of the tools and devices used in scientific research and clinical settings. Conducting forensic investigations typically involves a range of tools and methodologies, including toxicology and pathology, which may utilize pharmaceuticals in a limited context but are not their main purpose.