Gustafson's method used for age estimation of the tooth includes all except -: (A) Primary dentition, (B) Root resorption, (C) Root transparency, (D) Attrition
Answer is A. Gustafson's method includes :

(i) Attrition, 
(ii) Paradentosis,
(iii) Secondary dentin formation,
(iv) Cementum apposition,
(v) Root resorption and
(iv) Transparency of the root.