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Opening of pulmonary veins in the left auricle do not carry any valve but there is no back-flow or blood while left auricle contracts because of the fact that:

[A].	Valves in pulmonary veins check back flow	[B].	Contraction of left auricle automatically closes the opening of pulmonary veins
[C].	Inter-auricular septum helps to close the opening	[D].	There is some other reason

Answer: Option B

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