Explanation:

- Order 49, Rule 2 of the Code of Civil Procedure deals with "saving in respect of Chartered High Courts." It specifies that certain rules regarding the competency of judges and other procedural matters do not apply to Chartered High Courts.

- Order 25, Rule 5 concerns provisions related to security for costs in lawsuits and does not address Chartered High Courts.

- Order 31, Rule 9 involves the rules governing suits by or against minors and persons with disabilities but is unrelated to Chartered High Courts.

- Order 16, Rule 10 pertains to the summoning and attendance of witnesses in court and does not directly address Chartered High Courts.

Order 49, Rule 2 is the correct answer.