Consider the following pairs:

International Agreement/set-up	Subject
1. Alma-Ata Declaration	Healthcare of the people
2. Hague Convention	Biological and chemical weapons
3. Talanoa Dialogue	Global climate change
4. Under 2 Coalition	Child rights

Which of the pairs above is/are correctly matched?

The correct answer is 1 and 3 only.

Let us analyze each of the given pairs step-by-step to understand why they are correctly or incorrectly matched:

1. Alma-Ata Declaration - Healthcare of the people:
The Alma-Ata Declaration was adopted at the International Conference on Primary Health Care in 1978 (in Alma-Ata, Kazakhstan). It identified primary health care as the key to attaining the goal of "Health for All" around the globe. Thus, this pair is correctly matched.

2. Hague Convention - Biological and chemical weapons:
The Hague Conventions of 1899 and 1907 primarily address the laws of war, war crimes, and the declaration of peace, while other specific conventions (like the Biological Weapons Convention and the Chemical Weapons Convention) deal with biological and chemical weapons. Additionally, the well-known "Hague Convention" in civil international law refers to treaties like the Hague Convention on the Civil Aspects of International Child Abduction. Therefore, matching it directly to biological and chemical weapons as its primary subject is incorrect.

3. Talanoa Dialogue - Global climate change:
The Talanoa Dialogue was launched at the UN Climate Change Conference (COP 23) in 2017. It is a facilitative process designed to help countries implement and enhance their Nationally Determined Contributions (NDCs) by 2020 to combat global climate change. Thus, this pair is correctly matched.

4. Under 2 Coalition - Child rights:
The Under 2 Coalition is a global coalition of subnational and state governments committed to keeping global temperature rises well below 2°C (specifically aiming for 1.5°C) to combat climate change. It is not related to child rights (which is primarily addressed by conventions like the UN Convention on the Rights of the Child). Thus, this pair is incorrectly matched.

Since only pairs 1 and 3 are correctly matched, the correct option is "1 and 3 only".