The pediatrician is doing a routine physical exam on a school-aged child and tells the parents that ...

The pediatrician is doing a routine physical exam on a school-aged child and tells the parents that their child has an innocent heart murmur. The parents ask the nurse what this means. The best answer is:
 
  a. The mitral valve is not closing tightly and some blood is getting through when the heart is not contracting.
  b. If the child's heart is not overworked for the next few years, this problem will cure itself.
  c. This is a minor congenital anomaly and is nothing to worry about as it will cause no problems.
  d. This is the sound of blood normally flowing through the heart and is not associated with any heart problem.