Task: Classify the mental state of the tweeter based on the tweet, determining if it is 'neutral or no emotion' or characterized by any of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: His interlocutor burst out laughing several times at his answers; and more than ever, when to the question, ‘ whether he had been cured?�
This tweet contains emotions: 
joy, optimism