Answer:
So they know what medications are safe and unsafe to prescribe
Step-by-step explanation:
When we're dealing with health-related issues and decide to visit our doctor, we need to be honest and straightforward with them. This is the only way they will be able to give us proper treatment. For example, if we are already taking some medication and have begun experiencing side-effects, we need to tell our doctor so that they can prescribe us another type of medication or adjust the dosage. Some people are ashamed of the symptoms they are experiencing or don't think they are worth mentioning, but everything should be mentioned so that a proper diagnosis can be made and proper medication is prescribed.
Being honest and straightforward has nothing to do with how the visit will be billed, and doctors aren't allowed to discuss their patients' cases with other people, including their parents (unless the patient is a minor). This is why the rest of the options are incorrect.