Read the paragraph and answer the objective questions given at the end of it:
In summer a decomposed unidentified dead body was found floating in a river. The postmortem examination revealed the presence of weeds in the hand of the deceased. The internal examination of deceased body showed the presence of froth in trachea and diatoms in the lungs.
1.) Estimation of age examination of teeth is by
a. Pearson’s method
b. Gustafson’s method
c. Galton’s method
d. Bertillon’s method