This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Non communicable diseases, Subject name: Social & Preventive Medicine
Which of the following is not a barrier method ? 
Select and explain. 
A. Cenntchroman, B. Today, C. Barrier contraceptive, D. None
A: Cenntchroman
Answer: A: Cenntchroman 
Explanation: <p> Centchroman is not a barrier method of contraception. Centchroman (sagely) is a synthetic non steroidal oral contraceptive. Reference:Park&;s textbook of preventive and social medicine,K.Park,23rd edition,page no:494. <\p>