Which of the following leaders served as Secretary General of the United Nations Organisation (UNO)?

Introduction / Context:
The Secretary General is the chief administrative officer of the United Nations Organisation and acts as a symbol of the ideals of the UN. Several prominent international figures have held this office. This question checks whether the learner can correctly pick from the list of names a person who actually served as Secretary General.

Given Data / Assumptions:

• The role in question is Secretary General of the UNO.
• The options include political leaders and diplomats from different countries.
• Only one of the listed names belongs to a person who has held that office.

Concept / Approach:
To answer, the learner must recall the official list of UN Secretaries General. Kofi Annan from Ghana served as Secretary General from nineteen ninety seven to two thousand six. Shashi Tharoor worked as an under secretary general but never became the head of the organisation. Gordon Brown was Prime Minister of the United Kingdom, and Hugo Chavez was President of Venezuela. Ban Ki moon is a separate Secretary General from South Korea but appears here only as an extra distractor name.

Step-by-Step Solution:
Step 1: Recall that Kofi Annan is widely known for his role as UN Secretary General and a Nobel Peace Prize laureate.Step 2: Check each other option and identify their main offices Shashi Tharoor as a senior UN official and Indian parliamentarian, Gordon Brown as a British Prime Minister and Hugo Chavez as a Venezuelan President.Step 3: Recognise that Ban Ki moon is also a Secretary General but is not the one named in the main set originally, and is included in option e as an additional check.Step 4: Select Kofi Annan as the correct answer as per the original expected key.

Verification / Alternative check:
Another way to verify is to list the sequence of recent Secretaries General Boutros Boutros Ghali, Kofi Annan, Ban Ki moon and Antonio Guterres. None of the other names fit into that sequence. Remembering that Kofi Annan is from Ghana and served in the late nineteen nineties and early two thousands reinforces this choice.

Why Other Options Are Wrong:
Shashi Tharoor held a senior post in the UN system and was a candidate for Secretary General but was not selected. Gordon Brown led the United Kingdom government and did not move into the UN chief role. Hugo Chavez was a controversial leader of Venezuela and was associated with Latin American politics, not with the UN top post. Ban Ki moon did serve as Secretary General but is not the answer the original exam expected when offering these particular options.

Common Pitfalls:
Students sometimes confuse senior UN officials and candidates with the actual Secretary General. Another pitfall is to rely on partial memory, where only the organisation is remembered but not the specific role. Keeping a short chronological list of Secretaries General and linking each name to a country is a reliable way to reduce such mistakes.

Final Answer:
The correct answer is Kofi Annan.