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
A 36 year old female recurrent chest pain and palpitation varying in duration and severity and 6-7 ectopics per minute (Possibly supraventrigation is) not related to exertion. Her BP is 86 mm Hg and pulse rate is 86/min. The ideal investigation is 
Select and explain. 
A. Echocardiography, B. Electrophysiological studies, C. Thallium study, D. Technetium pyrophosphate
B: Electrophysiological studies
Answer: B: Electrophysiological studies 
Explanation: None