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
Episodic muscular weakness is seen in- 
Select and explain. 
A. ↓K+, B. Lambert Eaton syndrome, C. Multiple sclerosis, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None