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: Just found out tonight my son will not be doing practical work counting towards his GCSE exam. OK then! I thought STEM was all the rage??
This tweet contains emotions: 
anger, pessimism