Concept:
The Drugs Technical Advisory Board (DTAB) is the highest statutory body that advises the Central and State Governments on technical matters arising out of the Drugs and Cosmetics Act, 1940. It has several members, some of whom hold their place by virtue of the office they occupy (ex-officio).
Step 1: Among the ex-officio members of the DTAB, the Director General of Health Services (DGHS) is designated to be the Chairman of the Board. This means whoever holds the post of DGHS automatically chairs the DTAB.
Step 2: The Director of the Central Drugs Laboratory and the Drugs Controller General of India are also ex-officio members of the DTAB, but they are not its Chairman. The President of the PCI is not part of the DTAB at all. Hence the Chairman is the Director General of Health Services.
Answer: Option (3) — The ex-officio Chairman of the DTAB is the Director General of Health Services. (3)