Five jumbled up sentences (labelled 1, 2, 3, 4 and 5), related to a topic, are given below.Four of them can be put together to form a coherent paragraph. Identify the odd sentence and key in the number of that sentence as your answer.

The correct answer is 4.

Analysis of the Sentences:
To identify the odd sentence, let us examine the theme and logical connection of each sentence:
1. "The UK is a world leader in developing cultivated meat and the approval of a cultivated pet food is an important milestone." – Introduces the UK's leadership in cultivated meat and a specific recent milestone (approval of cultivated pet food).
2. "If we’re to realise the full potential benefits of cultivated meat the government must invest in research and infrastructure." – Outlines what is required (government investment in research and infrastructure) to fully realize the benefits of this technology in the future.
3. "The first UK applications for cultivated meat produced for humans remain under assessment with the Food Standards Agency." – Discusses the current status of regulatory approval for human consumption in the UK.
4. "The previous UK government had been looking at fast-tracking the approval of cultivated meat for human consumption." – Focuses on a political narrative and the actions of a "previous" government regarding fast-tracking approvals.
5. "It underscores the potential for new innovation to help reduce the negative impacts of intensive animal agriculture." – Elaborates on the significance of the milestone mentioned in Sentence 1 (the pronoun "It" directly refers to the "approval of a cultivated pet food" or the milestone itself).

Forming a Coherent Paragraph:
• Sentence 1 serves as the ideal introductory sentence, presenting the UK's position and the milestone of cultivated pet food approval.
• Sentence 5 naturally follows Sentence 1, as the pronoun "It" explains the significance of this milestone (how it reduces the impact of intensive animal agriculture).
• Sentence 3 transitions the discussion from pet food approval to the current status of applications for human consumption under the Food Standards Agency.
• Sentence 2 concludes the flow by stating the future steps needed (government investment) to realize the full benefits of this industry.
This forms a logical sequence of 1-5-3-2.

Why Sentence 4 is the Odd Sentence:
Sentence 4 shifts the focus away from the technological progress, environmental benefits, and general regulatory landscape of cultivated meat to a retrospective political detail about the "previous government's" plan to fast-track approvals. Since the paragraph flows smoothly from current milestones to future policy needs without requiring this specific political history, Sentence 4 is the odd sentence out.