A doctor is a very good source of information.

Choosing A reflects the understanding that doctors are highly trained professionals with extensive knowledge in health and medical science. They possess the expertise to diagnose conditions, understand complex medical issues, and recommend appropriate treatments based on current medical guidelines and research.

Doctors are equipped to provide a comprehensive range of information related to patient symptoms, potential diagnoses, treatment options, and overall health management. This holistic knowledge makes them reliable sources, not limited to mere prescriptions or symptoms.

Moreover, in addition to their medical training, doctors often stay updated on new medical discoveries and changes within healthcare policies, further solidifying their role as credible informants on health-related topics. Accessing their knowledge can significantly empower patients to make informed decisions regarding their health care. This understanding of the breadth of a doctor's role in providing health information supports the choice indicating that a doctor is indeed a very good source of information.