Answer:
Option (4).
Step-by-step explanation:
Medicinal chemistry is an interdisciplinary science that include medicinal chemistry, pharmaceutical chemistry and chemistry. This interdisciplinary branch mainly focus on the synthesis, design and development of new drugs.
Dorothy is a medicinal chemist, she mainly focus on the new drug discovery in a pharmaceutical company. She can research the chemical molecule present in spider venom and discover a new drug for pain medication. The topic of new pain medication of snake venom can be her assignment.
Thus, the correct answer is option (D).