Task: Identify the primary emotion conveyed in the tweet and assign it to either 'neutral or no emotion' or one or more of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best capture the tweeter's mental state.
Tweet: @FoxNews Very thought provoking &amp; leads one to question what really happened.Very sad for all.
This tweet contains emotions: 
sadness