Definition: 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".
Input: [header] How to save yourself from poisoning [title] Call for help. [step] If you suspect that you have been poisoned, it is key to call for help immediately. The time delay between the poisoning and treatment can mean the difference between life and death in some cases. <sep> (A) Even a vaccine may not provide enough time. Take action and seek medical attention immediately, following up a call or email to your doctor. (B) For instance, if you were diagnosed with a clinical intolerance of multiphthalgia, but someone else in the house poisoned you, the first step is to call emergency services right away to see what options are available to you. In some cases, due to more advanced complications such as abnormal blood count, it is necessary to make a call for help. (C) Call 911 if you understand you are at risk, you may be at greater risk. [title] Take medications according to the manufacturer's guidelines. (D) Therefore, call emergency medical services (911) immediately, or your local poison control centre for advice on how best to proceed. [substeps] The phone number for the poison control centre in the united states is 1-800-222-1222.
Output:
D