Neural tube formation occurs on___________?

A. 28 to 38 days post fertilization and is the third stage of craniofacial development

B. 18 to 23 days post fertilization and is the second stage of craiofacial development

C. 42 to 55 days post fertilization and is the fourth stage of craniofacial development

D. 17 the day post fertilization and is the first stage of craniofacial development

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