This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Symptomatic Conditions, Subject name: Ophthalmology
Most common foreign body to cause penetrating injury to ciliary body 
Select and explain. 
A. Ball, B. Hammer and chisel, C. Gun bullet, D. Vegetative material
B: Hammer and chisel
Answer: B: Hammer and chisel 
Explanation: Ans. (b) Hammer and chisel Ref: A.K. Khurana 6th ed. /163, 437