Question and Answer strategy is there in commentary writings. This strategy appears in the initial stage commenter onwards. In that way the Question and Answer strategy is available in the commentary of Periyavaachan Pillai who wrote full commentary for the vaishanava text Naalaayira Thivya Brapandham. We can find this strategy through the commentary of Thiruvaaciriam and Periya Thiruvanthaathi.  Periyavaachan Pillai has used the question types in his commentary which was mention in 13^th century Tamil Grammer Nanool.  Three type of question are appears in his commentary known as, known question, unknown question, doubtful question. This is good to trace the strategy of Question and Answer in devotional commentary. Because, it is wonder that the using of question and answer strategy for simplifying the unknown things which are difficult to understand. In his commentary we can find that somewhere question-answer method and somewhere only question method this method is to understand the things readers them self. This is best skill of Periyavaachan Pillai. That is why he is called king of commentary. This article tries to justify the above quotation.