This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
Zinc deficiency causes –  a) Hypo gonadism  b) Diarrhoea  c) Pigmentation  d) Psychosis  e) Defective carbohydrate metabolism 
Select and explain. 
A. ab, B. acd, C. abd, D. bcd
A: ab
Answer: A: ab 
Explanation: None