कथन (A): संविधानानुसार मुख्यमंत्री राज्यपालाच्या इच्छेपर्यंत पदावर राहतो.
कारण (R) : मुख्यमंत्र्याची नियुक्ती राज्यपालाद्वारे होते.

The correct answer is Option A (Both (A) and (R) are true and (R) is the correct explanation of (A)).

Key Points:
• Constitutional Provisions regarding Appointment and Tenure of Chief Minister (Article 164):
• Article 164(1): Explicitly provides that: "The Chief Minister shall be appointed by the Governor and the other Ministers shall be appointed by the Governor on the advice of the Chief Minister, and the Ministers shall hold office during the pleasure of the Governor."
• Assertion (A) is constitutionally correct because ministers (including the CM) hold office during the pleasure of the Governor.
• Reason (R) is constitutionally correct as the Chief Minister is appointed by the Governor under Art 164(1).
• In constitutional jurisprudence, the appointing authority exercises the power of pleasure of office (as codified in the General Clauses Act, Section 16); hence (R) directly explains (A).
• Key Takeaway: Under Article 164(1), the Governor appoints the Chief Minister, who holds office during the Governor's pleasure.