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: Pharmacology
The antibiotic that inhibits protein synthesis by premature chain termination and which structurally resembles an aminoacyl t-RNA is - 
Select and explain. 
A. Tetracycline, B. Chloramphenicol, C. Puromycin, D. Erythromycin
C: Puromycin
Answer: C: Puromycin 
Explanation: Ans. is 'c' i.e., Puromycin o Puromycin is a tRNA analogue which combines with amino acid in place of tRNA and forms a complex with amino acid that prevents addition of fuher amino acids to polypeptide (i.e. causes premature chain termination).