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
Copper deficiency is characterized by -a) Cardiomyopathyb) Anaemiac) Osteopeniad) Growth retardation 
Select and explain. 
A. bcd, B. acd, C. ac, D. bd
A: bcd
Answer: A: bcd 
Explanation: None