This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous system, Subject name: Physiology
Memory needed for repetitive skills is 
Select and explain. 
A. Declarative, B. Semantic, C. Explicit, D. Implicit
D: Implicit
Answer: D: Implicit 
Explanation: Implicit memory is subdivided into 4 types. Procedural memory includes skills and habits, which once acquired becomes unconscious and automatic. Ref: Ganong&;s review of medical physiology; 23rd edition; pg:290.