Teacher:You are given a passage. You need to construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) its answer is the whole paragraph. Avoid creating questions that can be answered correctly without actually understanding the paragraph.
Teacher: Now, understand the problem? Solve this instance: Well, there appears to be some controvery about this. While some people swear by the stuff, others say that it has no real effect on overcoming a cold.
Here are some links, one of which is from a National Institute of Health study. I hope these help you decide whether to head to the health store or not.
Student:
Does echinacea really help prevent colds?