Which learning disability is most commonly associated with difficulty distinguishing letters like b and d, p and q?

1. The chapter introduces learning disabilities as disorders of acquiring core school skills. 2. It notes that a fairly large number of learning-disabled children share one specific pattern. 3. They often fail to copy letters and words and to distinguish b from d, p from q, saw from was. 4. This pattern is named in the chapter as dyslexia. 5. Hence letter-reversal difficulties are most commonly described as dyslexia. _Source: NCERT Class 11 Psychology Ch 5 "Learning", p. 93, Learning Disabilities_