- **Article 85**: This Article deals with sessions of the Parliament, including prorogation and dissolution. It mandates that there should not be a gap of more than six months between two sessions. ✅

- **Article 89**: This Article is about the role of the Chairman and Deputy Chairman of the Rajya Sabha. It is not related to the sessions of Parliament.

- **Article 90**: This Article pertains to the disqualification of the Deputy Chairman of the Rajya Sabha.

- **Article 101**: This Article addresses the vacation of seats, not sessions of Parliament.

Your answer is Article 85. **YOUR ANSWER IS RIGHT**.