You need to measure the public perception of your brand on social media by using natural language processing. Which Azure service should you use?

Azure Cognitive Service for Language is a cloud-based service that provides Natural Language Processing (NLP) features for understanding and analyzing text.
Use this service to help build intelligent applications using the web-based Language Studio, REST APIs, and client libraries.
Note: Natural language processing (NLP) has many uses: sentiment analysis, topic detection, language detection, key phrase extraction, and document categorization.
Reference:
https://docs.microsoft.com/en-us/azure/cognitive-services/language-service/overview