After birth, . . . .. A . . . . Gets blocked by the deposition of . . . . . . B. . . . Fibres forming ligramentum arteriosum. Identify A and B.
A. `{:(A,B),("ductus arteriosus","connective"):}`
B. `{:(A,B),("eustachian valve","elastin"):}`
C. `{:(A,B),("traberculae valve","connective"):}`
D. `{:(A,B),("ductus arteriosus","elastin"):}`