Explanation
A judge's expression of opinion uttered in court or in a written judgement, but not essential to the decision is called "Obiter Dictum".
"Obiter Dictum" is a Latin term that means "something said in passing". It refers to a statement made by a judge in a court opinion that is not essential to the decision of the case. An "Obiter Dictum" does not establish a binding precedent for future cases, but it may provide guidance or insight into the judge's thinking on a particular legal issue.
In contrast, "Ratio Decidendi" refers to the essential part of a court's decision that establishes a binding precedent for future cases. It is the legal principle or rule that is necessary for the decision of the case.
Therefore, the correct answer to the question is option B: Obiter Dictum.
