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: @groovydadad @MHChat 🙂ty I often conflate the two depression + sadness, but they are very different. This q reminded me of that #mhchat
This tweet contains emotions: 
sadness