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: Pediatrics
A 13 year old boy has bilateral gynecomastia. i is height is 148 cm, weight 58 kg; the sexual maturity rating is stage 2. The gynecomastia is most likely due to – 
Select and explain. 
A. Prolactinoma, B. Testicular tumour, C. Pubertal gynecomastia, D. Chronic liver disease
C: Pubertal gynecomastia
Answer: C: Pubertal gynecomastia 
Explanation: None