Hi,
For going in any research field you have to complete the masters degree first then you can go into that field. So, if you want to become doctor first then you must do your MBBS. Otherwise if you are not having that aim then you can do B.Sc. If you do B.Sc then you will have one year less than MBBS and getting chance for M.Sc is easier than M.D. After MBBS, Various institutes that offer research opportunities are ICMR(Indian Council for Medical Research), CIMAP, CCMB(Centre for Cellular and Molecular Biology), St. John's Research institute. One can also join WHO. Many institutes like AIIMS, PGI, NIMHANS, Tata Institute of Fundamental Research, Mumbai (TIFR) offer a Ph.D. degree. There are two ways to switch over to research leading to Ph.D. for meritorious MBBS graduates. The main option is to get admission to a three-year medical postgraduate programme (MD or MS). Thereafter one can go for medical research leading to Ph.D. Besides this, a few research institutions admit meritorious medical graduates directly for research programmes. For example, Rajiv Gandhi Centre for Biotechnology under the Government of India functioning at Poojappura, Thiruvananthapuram, offers major research programme in disease biology and molecular medicine as well as plant biotechnology and discovery. First class (with 60 per cent marks) MBBS degree holders are also eligible for admission. This Ph.D. programme is affiliated to the University of Kerala. Those having a valid research fellowship from UGC- CSIR or ICMR, category A of Department of Biotechnology are eligible to receive fellowships. Medical Science and Technology, Thiruvananthapuram, Jawaharlal Institute for Postgraduate Medical Education and Research (JIPMER), Puducherry, Postgraduate Institute of Medical Education and Research, Chandigarh and Christian Medical College, Vellore provide research facilities leading to Ph.D. I hope this helps you.
All the Best.
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