Final answer:
The 'Sidh Ghosht' is the composition in Guru Granth Sahib Ji recording dialogues between Guru Nanak Dev Ji and the Siddhas.
Step-by-step explanation:
The composition in the Guru Granth Sahib Ji that records the dialogues Guru Nanak Dev Ji had with the Siddhas is B) Sidh Ghosht. This text is an important part of Sikh scripture and spiritual literature. It captures a series of deep philosophical discussions between Guru Nanak Dev Ji and the Siddhas, who were a group of yogis following a mystical path of meditation and austerity.