Given the task definition and input, reply with output. 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 make your hairline grow back [title] Use the right shampoo. [step] There are plenty of shampoos that claim to regrow hair, but some work better than others. Know what to look for before you invest any money in this type of specialty hair product. <sep> (A) [substeps] Look for a gentle shampoo that clears your pores without the use of harsh chemicals. Herbal shampoos can be especially beneficial. (B) Most regular shampoos will effectively regrow the hair long enough so that it doesn't lose any shine. If you've tried them all, you should be able to determine whether they are right for you. (C) [substeps] Look for products labeled as " keratin. " making this a part of hair naturally makes the hair grow. (D) To effectively grow hair using this product, keep a shampoo in your shower area and try not to use it more than one time. [substeps] Use a shampoo that is at least 30% conditioner.
A