Two statements marked as ASSERTION(A) and REASON(R) are given below. Choose the correct
answer as per the given codes: 

Assertion(A): states that the eyes of nocturnal, cave and deep-water dwelling animals have only rods in their retina. 

Reason(R): Rods provide high sensitivity to light but have relatively low spatial discrimination and no ability to distinguish different wavelengths. 

Choose the correct option