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B
Endoderm
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C
Mesoderm
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D
Mesenchyme
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Solution
The correct option is A Ectoderm Medulla oblongata develops from the ectoderm of the embryo and present in the human brain which is able to control autonomic or involuntary functions like heart rate, respiration and also involves in coughing, swallowing, secretion, reflexes and sneezing actions.