In a medico-legal case of accidental interchange between two babies in a hospital,the baby with blood group $A$ could not be the child of parents with which of the following blood group combinations?

  • A
    Both husband and wife of group $O$
  • B
    Husband of group $O$ and wife of group $A$
  • C
    Husband of group $A$ and wife of group $O$
  • D
    Both husband and wife of group $A$

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Blood group $AB$ has

Which of the following prevents the conversion of prothrombin to thrombin in an undamaged blood vessel?

Match the different types of leucocytes (Column-$I$) with their percentage of occurrence (Column-$II$) in a healthy adult and choose the correct answer.
Column-$I$Column-$II$
$A$. Neutrophils$(i)$ $6-8\%$
$B$. Lymphocytes$(ii)$ $60-65\%$
$C$. Monocytes$(iii)$ $0.5-1\%$
$D$. Basophils$(iv)$ $2-3\%$
$E$. Eosinophils$(v)$ $20-25\%$

After checking the blood groups of a husband and wife, a doctor advised them not to have more than one child. Which of the following could be the blood group combination of the couple?

Which substance is secreted by eosinophils during an allergic reaction?

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