International institution related to child welfare:

Concept: International organisations are each mandated to a specific domain — for example labour standards, public health, food and agriculture, or children's rights and welfare. Recognising which body owns which domain is the key skill this type of question tests.

Application: The stem asks for the institution whose core mandate is child welfare. Among the given bodies, UNICEF (United Nations Children's Fund) is the UN agency dedicated to children's rights, health, nutrition, education, and protection worldwide — exactly the child-welfare mandate the stem describes.

Contrast: The other three bodies each carry a different mandate:

• I.L.O. (International Labour Organization) sets and monitors international labour standards and working conditions.

• W.H.O. (World Health Organization) coordinates global public-health policy and disease control.

• F.A.O. (Food and Agriculture Organization) works on food security, nutrition standards, and agricultural development.

None of these three carries a child-welfare mandate, confirming UNICEF as the institution described in the stem.