This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax, Subject name: Anatomy
Sympathetic supply to hea 
Select and explain. 
A. C5 - C7, B. T1 - T4, C. C1 - C4, D. T5 - T9
B: T1 - T4
Answer: B: T1 - T4 
Explanation: Sympathetic nerves are derived from upper four to five thoracic segments of spinal cord .that is from T1-T4 ganglia. BD CHAURASIS'S HUMAN ANATOMY VOLUME 1. 6TH EDITION.Page no 267.fig.18.30