This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hypersensitivity, Subject name: Pathology
[{'content': 'Which of the following potentially represents the most dangerous situation? \nSelect and explain. \nA. Rh+ve mother with 2nd Rh-ve child, B. Rh-ve mother with 2nd Rh+ve child, C. Rh+ve mother with 1st Rh-ve child, D. Rh-ve mother with 1st Rh+ve child', 'role': 'user'}, {'content': 'Answer: B \nExplanation: * Rh-ve mother with 2nd Rh+ve child can result in the development of hemolytic disease of newborn or erythroblastosis fetalis. So, it is a dangerous condition. * This condition is a type II hypersensitivity reaction. * This is Not to be confused with Hemorrhagic disease of the newborn which is a coagulation disturbance in the newborns due to vitamin K deficiency. As a consequence of vitamin K deficiency there is an impaired production of coagulation factors II, VII, IX, X, C and S by the liver.', 'role': 'assistant'}]