চা ও কফিতে যে পদার্থটি শরীরকে চাঙ্গা করে তার নাম কি?

PSC BPSC Fisheries Survey Officer DXP Assistant Inspector of Explosives - 2003 BPSC Fisheries Survey Officer - 2026 সাধারণ বিজ্ঞান জৈব যৌগ (Organic Compounds)

PSC BIDA Assistant Director MoPA Personal Officer - 2016 DSS Probation Officer - 2013 BIDA Assistant Director - 2025 সাধারণ বিজ্ঞান জৈব যৌগ (Organic Compounds)

PSC GDA Building Inspector Primary Teacher Primary Assistant Teacher - 2022 SGCL – Senior Technician - 2023 PDBF – Field Officer - 2025 PWD Office Assistant - 2025 GDA Building Inspector - 2025 সাধারণ বিজ্ঞান জৈব যৌগ (Organic Compounds)

PSC DoF – SAE সাধারণ বিজ্ঞান জৈব যৌগ (Organic Compounds)

PSC WEWB – AD BCS 11th BCS Preli - 1991 BJS 6th BJS Preli - 2011 DPE Primary Head Teacher - 2009 5th BJS Preli - 2010 ECS District Election Officer/Assistant Secretary - 2004 38th BCS Preli - 2017 DPHE SAE (Civil) - 2015 Primary Teacher Primary Assistant Teacher - 2011 MoFA Assistant Cipher Officer - 2017 BTV Audience Research Officer - 2006 ATEO ATEO - 2012 BD Post Estimator - 2018 BR SAE (Bridge) - 2018 43rd BCS Preli - 2021 Biman – Ground Service Assistant - 2022 RHD Work Assistant - 2022 BRDB URDO - 2022 Primary Assistant Teacher - 2007 TGTDCL – Technician/Sales Assistant - 2023 BUET CPGCBL – Sub-Assistant Engineer - 2023 NESCO PLC – Sub-Station Attendant - 2024 WEWB – AD - 2024 BARD – AD - 2022 ECS – OA Cum Computer Operator - 2025 MoF – Office Support Staff - 2025 সাধারণ বিজ্ঞান জৈব যৌগ (Organic Compounds)

PSC Bangladesh Railway – ALM (Grade-2) সাধারণ বিজ্ঞান জৈব যৌগ (Organic Compounds)