Task: Categorize the tweet's emotional expression, classifying it as either 'neutral or no emotion' or as one or more of the specified emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that reflect the tweeter's state of mind.
Tweet: @FoxNews Very thought provoking &amp; leads one to question what really happened.Very sad for all.
This tweet contains emotions: 
sadness