Step 1: Understanding the Triple Entente.
The Triple Entente was an alliance formed before World War I between three major European powers: France, Russia, and Britain (England). This alliance was created to counter the growing influence of the Triple Alliance consisting of Germany, Austria-Hungary, and Italy.
Step 2: Members of the alliance.
France, Russia, and England were the core members of the Triple Entente. These countries cooperated politically and militarily during World War I.
Step 3: Identifying the odd one out.
Japan was not a member of the Triple Entente. Although Japan later joined the Allied Powers during World War I, it was not one of the original signatories of the Triple Entente alliance.
Step 4: Conclusion.
Therefore, Japan is the odd one out among the given options.
Final Answer: Japan.