Statement A: Centrosomes and centrioles are related to each other.
Statement B: Centrosome usually contains two cylindrical structures called centrioles.

The centrosome (occur only in animals cells) is the main place where cell microtubules get organized. Centrosome usually contains two cylindrical structures called centrioles. Centrioles are composed of groupings of microtubules arranged in a 9 + 3 pattern. The pattern is so named because a ring of nine microtubule "triplets" are arranged at right angles to one another. Centrioles, found in animal cells, help to organize the assembly of microtubules during cell division. Centrioles replicate during the interphase stage of mitosis and meiosis.