In this sports based general knowledge classification question, select the odd name from the given alternatives.

Introduction / Context:
This general knowledge reasoning question deals with famous Indian sportspersons. All four names belong to well known players, but three of them are associated with the same sport, while one is associated with a different sport. You must identify the odd name that does not fit with the others. Such questions test both sports awareness and classification skills.

Given Data / Assumptions:
- The names given are Dhanraj Pillay, Pankaj Advani, Dhyan Chand, and Sardara Singh.- All four are male Indian sportspersons.- We classify them by the main sport for which each is famous.

Concept / Approach:
The key idea is to recall the main sport connected with each person. Dhanraj Pillay, Dhyan Chand, and Sardara Singh are legendary or prominent players in Indian field hockey. Pankaj Advani, on the other hand, is a champion in cue sports such as billiards and snooker. Thus, three options come from hockey, and one from cue sports. The non hockey player is the odd one out.

Step-by-Step Solution:
Step 1: Dhanraj Pillay is a famous Indian hockey player who captained the national team.Step 2: Dhyan Chand is widely regarded as one of the greatest hockey players in history and is often called the hockey wizard.Step 3: Sardara Singh is also a well known Indian field hockey player and former captain.Step 4: Pankaj Advani is a world champion in billiards and snooker, which are indoor cue sports, not field hockey.Step 5: Three names are linked with field hockey, while one is associated with an entirely different sport.

Verification / Alternative check:
If you group the names by sport, you will place Dhanraj Pillay, Dhyan Chand, and Sardara Singh together under hockey. Pankaj Advani will naturally fall into a separate group of cue sports athletes. This separation confirms that Pankaj Advani is the odd one out.

Why Other Options Are Wrong:
Dhanraj Pillay: International Indian hockey player, so fits with Dhyan Chand and Sardara Singh.Dhyan Chand: Legendary Indian hockey player, part of the hockey group.Sardara Singh: Another famous Indian hockey player.

Common Pitfalls:
A common mistake is to focus on era or popularity instead of the sport itself. Even if players are from different generations, what matters here is that three names belong to the same game and one does not.

Final Answer:
The odd name is Pankaj Advani because he is associated with billiards and snooker, while the other three are hockey players.