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: Anaesthesia
In myasthenia gravis, which drugs should not be used – a) Gallamineb) Neostigminec) Aminoglycosidesd) Metronidazolee) Ampicilin 
Select and explain. 
A. a, B. bc, C. ad, D. ac
D: ac
Answer: D: ac 
Explanation: Non-depolarizing NM blocker (Gallamine) and antibiotics with NM blocking property (e.g. aminoglycosides) should be avoided in patients with mysthenia gravis.