Which leader of the British Labour Party was elected as the first Muslim Mayor of London?

Introduction / Context:
Big city mayoral elections in important global capitals are widely reported events. The election of the first Muslim Mayor of London was historic and often features in current affairs questions, especially related to politics, diversity, and representation. This question checks whether you can identify the correct Labour Party leader associated with this milestone.

Given Data / Assumptions:

• The office is Mayor of London, the capital city of the United Kingdom.
• The question specifies first Muslim Mayor and mentions the British Labour Party.
• Four names are given, of which only one corresponds to the well known politician who actually became Mayor.
• We assume knowledge of recent political events in the United Kingdom.

Concept / Approach:
The key concept is political current affairs. Sadiq Khan, a Labour Party politician of Pakistani origin, was elected Mayor of London in 2016, becoming the first Muslim to hold that office. The other names in the options are distractors and are not widely known as national level British politicians. Recognising the name Sadiq Khan is enough to answer this question.

Step-by-Step Solution:
Step 1: Recall that the first Muslim Mayor of London, elected in 2016, is Sadiq Khan. Step 2: Confirm that he is a senior member of the British Labour Party and represents London constituencies. Step 3: Examine the options and locate the name Sadiq Khan among them. Step 4: Recognise that the other names are not associated with the London mayoral office in international news. Step 5: Choose Sadiq Khan as the correct answer.

Verification / Alternative check:
International newspapers, magazines, and official London government websites clearly mention Sadiq Khan as the Mayor of London. His election was highlighted as a milestone for diversity in European politics. Revision booklets for current affairs around 2016 also carry this fact prominently. All of this confirms that Sadiq Khan is the correct choice.

Why Other Options Are Wrong:
Ataullah Khan: This name does not correspond to any widely known London mayor or major British national level politician.
Firdauz Zaidi: Again, not a recognised name in the context of the London mayoral elections.
Karim Shaikh: Also not associated with the Mayor of London position in reputable sources.

Common Pitfalls:
Sometimes, aspirants may confuse between local councillors, members of parliament, and the mayor. Another pitfall is to guess based on a name that sounds Muslim without actual recall of the news. The safest strategy is to remember clearly that Sadiq Khan is the well known Labour Party leader who became the first Muslim Mayor of London.

Final Answer:
The first Muslim Mayor of London from the British Labour Party is Sadiq Khan.