In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".

[header] How to choose a medication for attention deficit hyperactivity disorder [title] Choose between stimulants and non-stimulants. [step] Stimulant medication appears to be very effective at treating adhd symptoms; however, some non-stimulant medications are also used to treat adhd. Sometimes, non-stimulant medication will be used after stimulant medications have been ineffective. <sep> (A) [title] Observe where your adhd symptoms originate. [step] Try to reflect on when you have been exhibiting symptoms of adhd at the moment or right now. (B) Be clear from the outset of use whether you are taking medication or non-stimulant medication. [title] Choose non-stimulant medications for severe or recurring adhd symptoms. (C) [substeps] Many people choose generic methylphenidate stimulants as they are effective and cost efficient. Stimulants are the first line treatment for adolescents and children over six with adhd. (D) This may be best to start with if you don't currently have an adhd diagnosis. [title] Start with selective serotonin reuptake inhibitors.
C