This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gall Bladder & Bile Ducts, Subject name: Surgery
Gall stone pain referred to Shoulder pain Nerve root values 
Select and explain. 
A. C3-C5, B. C2-C8, C. T8-T9, D. T4-T6
A: C3-C5
Answer: A: C3-C5 
Explanation: Ans. (a) C3- C5Ref: Long Cases in Surgery by RRMBoas Sign:* In Cholecystitis, there is irritation of nociceptors present in Diaphragm which send afferent signals via C3/C4/C5 to the dorsal horn of spinal cord.* C4 dermatome covers the shoulder and converges on same area of spinal cord and hence interpreted as pain coming from shoulder in Gallbladder pain.