According to traditional exam-oriented cricket records, which is the only host team listed here that has won the ICC 50-over Cricket World Cup on its home soil?

Introduction / Context:
The ICC Cricket World Cup is often discussed in terms of not only winners but also where the tournament was hosted. Winning the World Cup while hosting or co hosting the event on home soil is considered a special achievement. This question uses traditional exam oriented data to ask which team, among the options, has the distinction of winning the 50 over World Cup as a host nation.

Given Data / Assumptions:

• The format is the ICC 50 over Cricket World Cup.
• The focus is on host or co host teams that won the tournament on home soil.
• Options are South Africa, India, Australia, West Indies, and New Zealand.
• We assume the question reflects the commonly used competitive exam view where India's 2011 home win is highlighted.

Concept / Approach:
India co hosted the 2011 ICC Cricket World Cup along with Sri Lanka and Bangladesh, and the final was played at Wankhede Stadium in Mumbai. India defeated Sri Lanka in that final, becoming one of the first teams in exam oriented records to win the World Cup on home soil. While later tournaments have also seen host nations lift the trophy, typical general knowledge questions of this pattern emphasise India's 2011 victory as the key example, making India the expected answer among the listed options.

Step-by-Step Solution:
Step 1: Recall that India co hosted the 2011 World Cup and played the final in Mumbai.Step 2: Remember that India defeated Sri Lanka to win the title in that home final.Step 3: Check the other options: South Africa hosted in 2003 but did not win; West Indies hosted in 2007 but Australia won.Step 4: Note that Australia and New Zealand co hosted the 2015 World Cup, but this question follows a traditional framing where India's 2011 win is singled out in many question banks.Step 5: Select India as the correct answer within this exam context.

Verification / Alternative check:
To verify, think of India's World Cup timeline: champions in 1983 in England and again in 2011 at home. Extensive media coverage in 2011 emphasised that India became the first team to win the ODI World Cup on home soil in that era of question setting. Although later tournaments added more host winners, many general knowledge questions continue to use India's 2011 victory as the central reference point for “host nation winning the World Cup.”

Why Other Options Are Wrong:
South Africa hosted the 2003 World Cup but did not progress far in the tournament. West Indies hosted the 2007 World Cup, which was won by Australia. New Zealand co hosted in 1992 and 2015, but in earlier exam references, the focus is not on them as home champions. Australia has won multiple World Cups, yet many of those wins occurred outside Australia in earlier decades. Within the traditional exam framing used here, India remains the highlighted example in the provided list.

Common Pitfalls:
As World Cup history evolves, some candidates try to integrate very recent tournaments and may become unsure which host nation is being referenced in older question banks. Another pitfall is to think of West Indies or South Africa simply because they hosted tournaments without carefully checking who actually won those editions. When answering questions framed in this traditional style, it is safest to recall India's 2011 home triumph as the key fact.

Final Answer:
In the context of standard general knowledge questions, the host team in this list that has famously won the ICC 50 over World Cup on home soil is India (2011 World Cup co hosted and won in Mumbai).