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
A woman presents with chest pain and shoulder pain. On examination, she is found to have pericarditis with pericardial effusion. This shoulder pain is mediated by 
Select and explain. 
A. Deep cardiac plexus, B. Superficial cardiac plexus, C. Phrenic nerve, D. Subcostal nerve
C: Phrenic nerve
Answer: C: Phrenic nerve 
Explanation: The pain of pericarditis is mediated by the phrenic nerve. The somatic sensation from the pericardium is carried by the somatic afferent fibers of the phrenic nerve. The pericardial pain may be referred to the supraclavicular region of the shoulder or lateral neck area (dermatomes C3, C4 and C5. Ref: Gray&;s Anatomy for students 3rd edition Pgno: 183