n. distortion of the face to express an attitude or feeling; anger; disapproval

'Grimace' refers to a facial distortion expressing strong feeling - often disgust, pain, anger, or disapproval. It's a contortion of the face to convey emotion. The other options don't fit: 'ascetic' means practicing self-denial, 'fallacy' is a false belief, and 'anarchy' means political disorder. Grimace is the only term describing facial expressions.