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
Left Axis Detion is seen are 
Select and explain. 
A. A Positive in Lead I and Positive in Lead 11, B. B Positive in Lead I and Negative in Lead II, C. C Negative in Lead I and Negative in Lead II, D. D Negative in Lead I and Positive in Lead II
B: B Positive in Lead I and Negative in Lead II
Answer: B: B Positive in Lead I and Negative in Lead II 
Explanation: Ans. is 'b' i.e., B Positive in Lead I and Negative in Lead II The normal QRS axis lies between -30deg and + 90". Left axis detion is conventionally diagnosed when QRS axis lies more leftward negative than -30". A quick way to assess QRS axis is to look at leads I and II. If the QRS axis is positive in leads 1 and II then the axis is normal. If the QRS complex positive in lead I and negative in lead II left axis detion. If the QRS complex is negative in lead I and positive in lead II right axis detion. Negative QRS complexes in both leads I and II most commonly indicates -4 incorrect positioning of the limb electrodes.