The correct answer is D. A medical journal
Step-by-step explanation:
A reliable source is always written by experts on the field; this implies, in the case of health information for a source to be reliable its authors need to be doctors or medical researchers. Additionally, the authors of the source need to be objective, which means they do not have economic, interests. Besides this, it is advised the source is updated and it is reviewed by other experts.
According to this, the most reliable source of health information is a medical journal because medical journals are written by experts in the field of medicine; they do not support personal or economic interest as it can occur in advertisements; and also these are often updated and peer-review which means the information in these is checked by other experts before the medical journal is published.