Which trace element is required for the proper functioning of the immune system, particularly in the activation of T-cells?

A Zinc ✓
B Iron
C Copper
D Selenium

Explanation

Zinc is an essential trace element that plays a critical role in the proper functioning of the immune system, including the activation of T-cells, which are a type of white blood cell that helps to fight infections.

Source

National Institutes of Health
Minerals, and Trace Elements Minerals and Trace Elements Immune Function Medium MEDICAL Confidence: high