The correct option is Sesamum.
Explanation
Cropping patterns in India are determined by climatic factors such as temperature and rainfall. While some crops are strictly bound to specific seasons (Rabi, Kharif, or Zaid), others demonstrate regional variations where the sowing season changes based on the geographical location (North vs. South India).
Analysis of Options:
- Sesamum (Til): This is the correct answer. In North India, it is cultivated as a Kharif crop dependent on monsoon rains. In South India, it is grown as a Rabi crop.
- Groundnut: It is primarily a Kharif crop and accounts for about half of the major oilseeds produced in the country. While rabi groundnut cultivation exists in parts of the peninsula, it is not the primary classification used to distinguish the crop's seasonality between North and South.
- Mustard: It is a distinct Rabi crop, sown in winter and harvested in spring, predominantly in North and Central India.
- Linseed: It is also a Rabi crop.
Note: Castor seed is another oilseed mentioned in standard texts as being grown both as a Rabi and Kharif crop, but without the strict North-South separation applied to Sesamum.
Key Takeaway: Sesamum is unique among major oilseeds for being a Kharif crop in North India and a Rabi crop in South India.