A
Vice-Chairman of NITI Aayog
B
Director General of CSIR
C
Ministry of Science and Technology Secretary
D
Principal Scientific Adviser to the Government of India
Correct answer: (d) Principal Scientific Adviser to the Government of India
Explanation
Option D is correct because the Principal Scientific Adviser to the Government of India chaired the Fourth All S&T Clusters' Meet in Chandigarh. Options A, C, and D name different officials who did not chair this specific meeting according to the official records.
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