Step 1: Understand the term "ex-officio Chairman of the Rajya Sabha".
The Constitution of India lays down that the Vice-President of India shall be the "ex-officio" Chairman of the Rajya Sabha (the Council of States). "Ex-officio" means that a person holds a position automatically by virtue of holding another office.
Step 2: Identify the current Vice-President of India.
The current Vice-President of India is Shri Jagdeep Dhankhar.
Step 3: Connect the office to the person.
Since the Vice-President is the ex-officio Chairman of the Rajya Sabha, Jagdeep Dhankhar automatically holds this position.
Droupadi Murmu is the President of India.
Narendra Modi is the Prime Minister of India.
Om Birla is the Speaker of the Lok Sabha.