Which Azure service converts speech into text?

Correct answer: Azure Speech to Text

Option A is correct because Azure Speech to Text (part of Azure AI Speech) is the dedicated service that uses deep learning models to convert spoken audio into written text, supporting real-time and batch transcription, custom acoustic and language models, and speaker diarization. Option B is wrong because Azure Cognitive Search is a cloud search service for indexing and querying structured and unstructured text content, not for processing audio input. Option C is wrong because Azure Translator is a text-to-text neural machine translation service that converts written text between languages, not speech to text. Option D is wrong because Azure Bot Service provides a platform for building conversational agents and may integrate speech capabilities, but it is not itself the speech-to-text conversion service.