This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fundamentals in Radiology, Subject name: Radiology
In MRI the commonly field used is - 
Select and explain. 
A. 0.05 tesla, B. 100 tesla, C. 1.1 tesla, D. 11 tesla
C: 1.1 tesla
Answer: C: 1.1 tesla 
Explanation: In MR examination, a large static magnetic field is applied. Field strengths for clinical equipment can vary between 0.2 and 7 T Most commonly used current MRI machines in diagnostic use are of 1.1 and 1.5T. Hence the single best answer would be 1.1 T The field strength of the magnet will influence the quality of the MR image regarding: * chemical shift aifacts * the signal to noise ratio (SNR) * motion sensitivity and susceptibility aifacts.