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".
Q: [header] How to use cialis [title] Get a prescription for cialis daily for regular use. [step] You can use cialis on a daily basis at a lower dosage. Cialis daily helps to prevent erectile dysfunction 24 hours a day. <sep> (A) [substeps] Single dose cialis is usually taken daily for one to three weeks. For men, three to four weeks is sufficient. (B) [substeps] Consult your doctor first to determine the amount of cialis you need to use. The doctor will walk you through how much cialis is currently in your body and give you an optimal dose. (C) You will need to apply it twice a day as needed for the first week of use. [substeps] Side effects include nausea and constipation, double flow cycle (a coming and going period), and hardening, sometimes temporary. (D) This may be a good option if you plan to have sex at least 2-3 times a week. [substeps] Cialis daily will come in doses of 2.5 to 5 mg.
A:
D