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 choose vitamins and supplements to prevent flu [title] Try taking zinc syrup or lozenges. [step] Zinc has long been believed to have immune boosting properties. Research on the precise effectiveness of zinc has produced mixed results, but zinc may be able to reduce the likelihood of becoming sick. <sep> (A) Zinc is usually sold with vitamin b12 in 100 %. Consuming 3 grams a day might seem like a good amount, but begin counting down from 100 if you don't feel well immediately. (B) Taking too much zinc will likely lead to one of the following health conditions : [substeps] Bingeing, so the pharmacist will provide you with zinc syrup or lozenge while you're taking zinc. Keeping your zinc consumption down will help promote healthy appetite and may increase your energy levels. (C) If it is safe for you to take zinc given your current health and any existing medications, taking zinc in the form of syrup or lozenges may reduce your risk of contracting the flu. [substeps] It's best to take zinc in the form of lozenges and syrups. (D) [substeps] Zinc which may have been mixed with other sweeten or peppermint boosts the immune system by increasing blood sugar levels and boosting the cell count. Zinc has also been found to have damaging interactions with your immune system and bone structure.
Output:
C