Fill in the given blanks: 
Star schema is a modeling technique widely adopted by relational data warehouses. In Star Schema, ……….. tables store events or observations and ………… tables define the business entities.

Answer options:

A.Fact, Dimension
B.Dimension, Fact
C.2D, 3D
D.Structured and unstructured
E.Unstructured and structured

Correct Answer: A 
Dimension tables define business entities i.e the things, you model. Entities include people, products, concepts and places including time itself. Fact tables store events or observations and can be stock balances, sales orders, temperatures and exchange rates, etc. A fact table consists of dimension key columns related to dimension tables and numeric measure columns.
Option A is correct. Fact tables and Dimension tables are the right answers.
Option B is incorrect. Fact tables store events or observations and Dimension tables define business entities.
Option C is incorrect. 2D and 3D is not the right answer.
Option D is incorrect.Dimension and fact are two different types of tables used in Star Schema.
Option E is incorrect. Dimension and fact are two different types of tables used in Star Schema.
Reference: 
To know more about Star Schema, please visit the below-given link: 

https://docs.microsoft.com/en-us/power-bi/guidance/star-schema#star-schema-overview