The correct answer is: Only argument I is strong.
Argument I is strong because it provides evidence to support the claim that all drugs patented and manufactured in Western countries should be first tried out on sample basis before giving licence for sale to general public in India. The evidence is that many such drugs require different doses and duration for Indian population. This means that if these drugs are not tried out on a sample basis, there is a risk that they may not be effective or safe for Indian people.
Argument II is weak because it does not provide any evidence to support the claim that it is not feasible to try out all drugs patented and manufactured in Western countries on a sample basis before giving licence for sale to general public in India. The argument simply states that it is not feasible, but it does not explain why it is not feasible. It is possible that there are ways to make it feasible to try out these drugs on a sample basis.
In conclusion, only argument I is strong.