Choose correct statements regarding iron ore.
\[
\begin{aligned}
A.&\ \text{Pyrolusite is the best quality of iron ore and contains 72\% iron.}
B.&\ \text{Limonite contains 40\% to 60\% iron metal.}
C.&\ \text{Most of the haematite ores are found in Dharwad and Cuddapah rock systems of India.}
D.&\ \text{Siderite, also known as ``iron carbonate'', is of inferior quality and contains less than 40\% iron.}
\end{aligned}
\]
Choose the correct answer from the options given below: