Among the options provided, Option 1: Chevron is not a drug/pharma company. Here`s a detailed reasoning for this answer:

1. Chevron: Chevron Corporation is an American multinational energy corporation primarily engaged in the exploration, production, and refining of oil and gas. It is not involved in the development, manufacturing, or distribution of pharmaceutical drugs. Chevron operates in the energy sector and focuses on activities related to oil and gas exploration, refining, and marketing. It is known for its involvement in the production and distribution of petroleum products and has no connection to the pharmaceutical industry.

2. Nicholas Piramal: Nicholas Piramal, now known as Piramal Enterprises Limited, is an Indian pharmaceutical company. It is actively involved in the development, manufacturing, and marketing of a wide range of pharmaceutical products, including branded generics, over-the-counter products, and active pharmaceutical ingredients (APIs). Nicholas Piramal has a significant presence in the Indian pharmaceutical market and has made strategic acquisitions to expand its global footprint. It is a prominent player in the pharmaceutical industry.

3. Pfizer: Pfizer Inc. is a well-known global pharmaceutical company headquartered in the United States. It is one of the world`s largest pharmaceutical companies and has a wide range of products in various therapeutic areas. Pfizer is involved in the research, development, manufacturing, and marketing of prescription drugs, vaccines, and consumer healthcare products. It has a strong presence in the global pharmaceutical market and has made significant contributions to medical advancements.

4. Zydus Cadila: Zydus Cadila is an Indian pharmaceutical company that focuses on research, development, manufacturing, and marketing of a diverse range of healthcare products. It operates in multiple segments, including human health, animal health, and wellness products. Zydus Cadila has a strong presence in the Indian pharmaceutical market and has also expanded its global reach through exports and acquisitions. It is actively involved in drug discovery and development and has a diverse portfolio of pharmaceutical products.

In summary, among the options provided, Chevron (Option 1) is not a drug/pharma company. Chevron is primarily engaged in the energy sector, particularly oil and gas exploration, production, and refining, and has no involvement in the pharmaceutical industry.