This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitamins and Minerals, Subject name: Biochemistry
Use of Zinc in diarrhoea is because it : 
Select and explain. 
A. Reduces the risk, duration and severity of diarrheal episodes, B. Enhances immune response, C. Regulates intestinal transpo & absorption of water and electrolytes, D. All
D: All
Answer: D: All 
Explanation: Zinc is a vital micronutrient essential for:- Protein synthesis Cell growth and differentiation Enhances immune response Intestinal transpo/absorption of water and electrolytes Improves regeneration of the intestinal epithelium Increases the levels of brush border enzymes Critical role in metallo-enzymes Polyribosomes Zinc deficiency:- Increased risk of gastrointestinal infections Adverse effects on the structure and function of the gastrointestinal tract Disease is known as Acrodermatitis enteropathica Impaired immune function Administration of zinc along with new low osmolarity ORS, can reduce the risk, duration and severity of diarrheal episodes for up to three months.