Given the task definition and input, reply with output. In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].

(CNN) Medical marijuana is now legal in 29 states and the District of Columbia. But the law is not quite as black and white regarding marijuana extracts such as cannabidiol. CBD is one of the active ingredients in cannabis, increasingly thought to offer wide-ranging health benefits, with few side effects and little risk of addiction or abuse. "More and more evidence is coming out that CBD can be helpful for a variety of conditions, from anxiety to inflammation to seizures and epilepsy," said Marcel Bonn-Miller, an adjunct assistant professor of psychology in psychiatry at the University of Pennsylvania. No surprise, dozens of companies are jumping on the proverbial bandwagon, peddling these products to consumers who have high hopes that they will help treat myriad ailments, from chronic pain to PTSD.Cannabidiol is a compound in marijuana that can provide medicinal benefitsA new study finds that only one-third of CBD products sold online are accurately labeled 
 Question:The researchers found that only 31% of the products tested contained the precise amount of CBD advertised on the label (within the acceptable margin of error), while 26% contained less _ than the label indicated and 43% contained more.

CBD