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: Radiology
Velocity of X-ray is: 
Select and explain. 
A. 1 lakh miles/sec, B. 2 lakh miles/sec, C. 3 lakh miles/sec, D. 0.5 lakh miles/sec
B: 2 lakh miles/sec
Answer: B: 2 lakh miles/sec 
Explanation: X-rays are electromagnetic radiations with following properties:

Velocity = 3 x 108 m/sec or 2 lakh miles/sec
They cannot be focused, reflected or refracted.
They cast the shadow of the objects falling in their path.
They are affected by electric and magnetic field.

Ref: Karjodkar 3rd Ed, Pg-72