Select an option which is true regarding the following two statements labelled Assertion (A) and Reason (R).

A. Some people have darker skin colour.

R. Some people have blood of darker colour.

Assertion (A) is true: Some people do indeed have darker skin color, which is influenced by factors such as melanin production.

Reason (R) is true: While blood is generally red due to hemoglobin, it can appear darker or lighter depending on oxygenation levels, but it does not explain skin color directly.

Thus, the correct option is C: Both 'A' and 'R' are true but 'R' is not the correct explanation of 'A'.