Answer: Slot

**Explanation:** In Amazon Lex, when a user provides specific information like dates, names, or other entities within their utterance, these are extracted using **Slots**. - **Intent**: Represents the overall goal or action the user wants to perform (e.g., "BookAppointment"). - **Slot**: Captures specific pieces of information or parameters needed to fulfill the intent (e.g., date, time, name). In this case, "tomorrow" is a date value that would be extracted into a date slot. - **Lambda Function**: Used for additional processing or validation, not for direct extraction of user inputs. - **Alias**: Refers to different versions or environments of a bot, not for input extraction. Therefore, the correct answer is **B) Slot**.

Author: Ritesh Yadav