This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
First symptom of digoxin overdose is- 
Select and explain. 
A. GIT disturbance, B. U-vave on ECG, C. Ectopic on ECG, D. Fainting spells
A: GIT disturbance
Answer: A: GIT disturbance 
Explanation: the first symptom of digoxin overdose is GI disturbance ie nausea and anorexia Ref Davidson 23rd edition pg 460